Bump acorn from 5.7.3 to 7.4.1

[dependabot[bot]]

Bumps acorn from 5.7.3 to 7.4.1.

Commits

• 88c2669 Mark version 7.4.1
• 9c9142a Fix potentially-exponential regular expression in use-strict-scanning
• 54efb62 Mark version 7.4.0
• 856b720 Remove link to plugin that's part of the repository now
• e376a66 add numeric separators
• d20ade2 update test262
• fe7b3f1 add logical assignment operators
• 459fa1e update test262
• 4e2c0e2 Also add license header to other packages
• 31d3b1c Add "MIT License" at the top of acorn License file
• Additional commits viewable in compare view

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