Bump terser from 4.8.0 to 5.6.1

[dependabot-preview]

Bumps terser from 4.8.0 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

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

• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #245.