Bump terser from 5.6.0 to 5.6.1 in /src

[dependabot[bot]]

Bumps terser from 5.6.0 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

Commits

• See full diff in compare view

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[dependabot[bot]]

Looks like terser is up-to-date now, so this is no longer needed.