Bump terser from 4.8.0 to 5.6.0

[dependabot-preview]

Bumps terser from 4.8.0 to 5.6.0.

Changelog

Sourced from terser's changelog.

Changelog

v5.5.1

• Fixed object properties with unicode surrogates on safari.

v5.5.0

• Fixed crash when inlining uninitialized variable into template string.
• The sourcemap for dist was removed for being too large.

v5.4.0

• Logical assignment
• Change let x = undefined to just let x
• Removed some optimizations for template strings, placing them behind unsafe options. Reason: adding strings is not equivalent to template strings, due to valueOf differences.
• The AST_Token class was slimmed down in order to use less memory.

v5.3.8

• Restore node 13 support

v5.3.7

Hotfix release, fixes package.json "engines" syntax

v5.3.6

• Fixed parentheses when outputting ?? mixed with || and &&
• Improved hygiene of the symbol generator

v5.3.5

• Avoid moving named functions into default exports.
• Enabled transform() for chain expressions. This allows AST transformers to reach inside chain expressions.

v5.3.4

• Fixed a crash when hoisting (with hoist_vars) a destructuring variable declaration

v5.3.3

• source-map library has been updated, bringing memory usage and CPU time improvements when reading input source maps (the SourceMapConsumer is now WASM based).
• The wrap_func_args option now also wraps arrow functions, as opposed to only function expressions.

v5.3.2

• Prevented spread operations from being expanded when the expanded array/object contains getters, setters, or array holes.
• Fixed very slow self-recursion in some cases of removing extraneous parentheses from + operations.

... (truncated)

Commits

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Superseded by #232.