Bump acorn from 7.1.0 to 7.3.1

[dependabot[bot]]

Bumps acorn from 7.1.0 to 7.3.1.

Commits

• e265eae Mark version 7.3.1
• 50fd1bc Mark version 7.1.0 of acorn-loose
• ee03be3 Mark version 7.3.0
• 4adea30 add optional chaining
• eec9b37 Fix parsing of ambiguous object pattern with a 'set' property with a default ...
• f66c4e7 Add type definitions for acorn.mjs (#954)
• 304ae5e Enable allowAwaitOutsideFunction in test262, update whitelist
• 6d555e8 Mark verison 7.2.0
• 82ed10d make test262 success on Windows
• ec7cbd1 Add nullish coalescing
• Additional commits viewable in compare view

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