Bump terser from 4.3.9 to 5.7.1

[dependabot-preview]

Bumps terser from 4.3.9 to 5.7.1.

Changelog

Sourced from terser's changelog.

v5.7.1

• Avoided collapsing assignments together if it would place a chain assignment on the left hand side, which is invalid syntax (a?.b = c)
• Removed undefined from object expansions ({ ...void 0 } -> {})
• Fix crash when checking if something is nullish or undefined (#1009)
• Fixed comparison of private class properties (#1015)
• Minor performance improvements (#993)
• Fixed scope of function defs in strict mode (they are block scoped)

v5.7.0

• Several compile-time evaluation and inlining fixes
• Allow reduce_funcs to be disabled again.
• Add spidermonkey options to parse and format (#974)
• Accept {get = "default val"} and {set = "default val"} in destructuring arguments.
• Change package.json export map to help require.resolve (#971)
• Improve docs
• Fix export default of an anonymous class with extends

v5.6.1

• Mark assignments to the .prototype of a class as pure
• Parenthesize await on the left of ** (while accepting legacy non-parenthesised input)
• Avoided outputting NUL bytes in optimized RegExps, to stop the output from breaking other tools
• Added exports to domprops (#939)
• Fixed a crash when spreading ...this
• Fixed the computed size of arrow functions, which improves their inlining

v5.6.0

• Added top-level await
• Beautify option has been removed in #895
• Private properties, getters and setters have been added in #913 and some more commits
• Docs improvements: #896, #903, #916

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.

... (truncated)

Commits

• d3d924f 5.7.1
• f45230a skip test
• a4154e9 update changelog
• 6d08df9 do not collapse vars/assigns which have a chain on their right hand side. Clo...
• e9d32ee pass compressor to is_undefined
• 6f04338 remove expansions from objects when we know the value being expanded is nulli...
• bfc332c fix broken names output. Closes #994
• 2835581 fix missing compressor argument in is_nullish and is_undefined
• 215db3c fix: missing compressor arg in optimize AST_VarDef (#1009)
• 60a74bb fix: private class element access equality (#1015)
• Additional commits viewable in compare view

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