Bump acorn from 8.15.0 to 8.18.0

[dependabot]

Bumps acorn from 8.15.0 to 8.18.0.

Commits

• d788421 Mark version 8.18.0
• b61cb9a Add startLocation option
• c8d515c Don't compute curLine when locations are off
• a7bd3cd Reject an unparenthesized arrow function as the left operand of **
• b7c31b6 Fix mistake in previous patch
• 5c4af50 Avoid scanning from start of document in loose parser's resetTo
• 5b9d16c Mark version 8.17.0
• 449f9fa Make linter happy
• 9e1bced Add a strict option to turn on strict mode for scripts
• 8a47812 Convert stack overflow errors to SyntaxError instances
• Additional commits viewable in compare view

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Summary by cubic

Upgrade acorn from 8.15.0 to 8.18.0 to pick up spec-compliance fixes, new options, and minor performance improvements. Notable behavior changes: unparenthesized arrow functions as the left operand of ** are now rejected, and stack overflows surface as SyntaxError.

• Build-only change (updates in package.json and yarn.lock); defaults unchanged and no migration required.
• New options available if needed: strict (enable strict mode for scripts) and startLocation.
• If any parsing depended on accepting (x => x)**2, add parentheses to the arrow function or operand.

^{Written for commit 59ae9d5. Summary will update on new commits.}

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[ktsaou]

Superseded by #3021, which consolidates this compatible JavaScript parser update with the related build dependencies that share its validation surface.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.