chore(deps): update dependency handlebars to v4.7.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
handlebars (source)	4.7.6 -> 4.7.7

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Release Notes

wycats/handlebars.js

v4.7.7

Compare Source

• fix weird error in integration tests - eb860c0
• fix: check prototype property access in strict-mode (#​1736) - b6d3de7
• fix: escape property names in compat mode (#​1736) - f058970
• refactor: In spec tests, use expectTemplate over equals and shouldThrow (#​1683) - 77825f8
• chore: start testing on Node.js 12 and 13 - 3789a30

(POSSIBLY) BREAKING CHANGES:

• the changes from version 4.6.0 now also apply
  in when using the compile-option "strict: true". Access to prototype properties is forbidden completely by default, specific properties or methods
  can be allowed via runtime-options. See #​1633 for details. If you are using Handlebars as documented, you should not be accessing prototype properties
  from your template anyway, so the changes should not be a problem for you. Only the use of undocumented features can break your build.

That is why we only bump the patch version despite mentioning breaking changes.

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