⬆️ Bump terser from 4.6.4 to 5.6.1

[dependabot-preview]

Bumps terser from 4.6.4 to 5.6.1.

Changelog

Sourced from terser's changelog.

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.

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.

... (truncated)

Commits

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Superseded by #436.