Update Rust crate handlebars to v5

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This PR contains the following updates:

Package	Type	Update	Change
handlebars	dependencies	major	=3.5.5 -> =5.0.0

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Release Notes

sunng87/handlebars-rust (handlebars)

v5.0.0

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• [Added] public mutable access to local variables in BlockContext [#​533]
• [Changed] Simplified lifetime specifiers for Helper, ScopedJson and some
  other related types and functions. [#​532]
• [Changed] Updated TemplateError to reduce its size. Direct field access is
  removed in favor of access methods
• [Changed] Introducing RenderErrorReason for typed render error
• [Changed] Changed register_template_directory api for more customizations
  #[610]
• [Changed] Updated rust-embed to 8.0

v4.5.0

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v4.4.0

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v4.3.7

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• [Fixed] Use fully qualified name of Result in handlebars_helper macro [#​578]
• [Fixed] Allow single-quote JSON literal [#​577]

v4.3.6

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[Fixed] Loading template files with multiple extensions, a bug introduced in 4.3.0 when refactoring directory source.

v4.3.5

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v4.3.4

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• [Added] New write_fmt function for Output [#​522]
• [Added] reason() method for TemplateError to access underlying reason,
  this replaces original direct .reason access.
• [Changed] Direct access to TemplateError's reason field is depreacted will
  be removed in future.

v4.3.3

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• [Fixed] Disable partial expression indentation with {{~> partial}} to
  bring behavior closer in line with original javascript version. [#​518]
• [Fixed] Support for using partial context together with partial parameters
  [#​520]

v4.3.2

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• [Added] Render functions that reuse Context for custom std::io::Write:
  render_with_context_to_write and render_template_with_context_to_write

v4.3.1

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• [Added] Added support for {{~{variable}~}} syntax [#​509]

v4.3.0

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• [Changed] update MSRV to 1.57 as rhai requires
• [Fixed] Reimplemented indent support for partial expression {{> partial}}, which is introduced in 4.2.0. The new implementation is
  aligned with original javascript version, that every text line
  generated from partial are indented as {{> partial}}
  does. prevent_indent will turn-off this feature. [#​505]
• [Changed] changed error support library from quick_error to
  thiserror

v4.2.2

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• [Fixed] Block param scope leaked into partials [#​496]
• [Changed] Use Rust 2021 edition and update MSRV to 1.56

v4.2.1

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• [Fixed] Nested partial @partial-block referencing issue [#​488]
• [Fixed] Docs generation on docs.rs for rust-embed feature

v4.2.0

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• [Added] RustEmbed support for loading templates from [#​484]
• [Fixed] Parser support for variables begins with digit [#​479]
• [Changed] Keep indent whitespaces for partial expression {{> partial}} as default in handlebarsjs. A new option prevent_indent
  is provided on Handlebars to turn off this behaviour. [#​486]
• [Changed] Update MSRV to 1.51 due to dependency changes

v4.1.6

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• [Added] Create Context from owned serde_json::Value [#​477]

v4.1.5

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• [Fixed] Single-quote string literal is supported, again [#​475]

v4.1.4

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• [Fixed] Corrected empty line stripping strategy [#​473]

v4.1.3

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• [Added] @last variable for each block with object [#​466]
• [Fixed] Missing whitespaces behind expression [#​468]

v4.1.2

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• [Added] Support for generic types in handlebars_helper!.
• [Added] Getter and setter for rhai Engine from registry.
• [Fixed] Improve doc for dev_mode that it has to be enabled before
  adding templates.

v4.1.1

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• [Changed] Update rhai to 1.0 [#​455]
• [Fixed] Empty line stripping for partial include statement, and other corner cases [#​458]

v4.1.0

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• [Added] export StringOutput as requested in #​442
• [Changed] strict mode now applies to our helper macro handlebars_helper! and
  built-in helpers based on it.
• [Fixed] Line stripping feature for standalone statment introduced in #​404 is now
  aligned with handlebarsjs. #​448

v4.0.1

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• [Fixed] Each block render error with empty array or object [#​445]

v4.0.0

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• [Added] dev_mode for registry: templates and scripts loaded from file are always
  reloaded when dev mode enabled [#​395]
• [Added] Registry is now Clone [#​395]
• [Added] New built-in helper len [#​421]
• [Changed] Updated rhai to 0.19 and then 0.20 [#​391]
• [Changed] #each helper now renders else block for non-iterable data [#​380]
• [Changed] TemplateError and ScriptError is now a cause of RenderError [#​395]
• [Changed] Empty lines around block helpers are now stripped [#​404]
• [Changed] Breaking RenderContext::get_partial now returns Option<&Template>
• [Changed] Breaking Capitalize names like HtmlExpression and IoError based on clippy recommendations [#​424]
• [Changed] Breaking Improved return type of call_inner from HelperDef to avoid misleading [#​437]
• [Fixed] reference starts with null, true and false were parsed incorrectly [#​382]
• [Fixed] dir source path separator bug on windows [#​389] [#​405]
• [Fixed] stack overflow with nested @partial-block [#​401]
• [Fixed] value access issue when upper block has a base value [#​419]
• [Fixed] escape rules for Json string literal [#​423]
• [Fixed] Breaking zero-arity subexpressions support [#​433]
  Zero-arity subexpression no longer resolved as variable. The behaviour is now aligned with handlebarsjs.
  For instance, {{(parent)}} can no longer access parent field of the context object, use
  {{lookup this "parent"}} instead. This change applies to partial inclusion, too.
• [Removed] Breaking option to disable source map is removed [#​395]
• [Removed] Breaking TemplateFileError and TemplateRenderError are removed and merged into
  TemplateError and RenderError [#​395]

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