Bump acorn from 6.1.1 to 6.4.1 in /serverless/functions

[dependabot[bot]]

Bumps acorn from 6.1.1 to 6.4.1.

Commits

• 9a2e9b6 Mark version 6.4.1
• 90a9548 More rigorously check surrogate pairs in regexp validator
• df0cf1a Mark version 6.4.0
• 5303412 Also export Parser via Parser.acorn
• efe273e give token types and etc to plugins
• ac6decb Mark version 6.3.0
• 7e9817d Allow sourceType: module even with ecmaVersion < 6
• e2b8cc0 Fix broken parsing of new expressions when allowReserved=="never"
• 1555c52 Update acorn.d.ts
• 77c20fa Mark version 6.2.1
• Additional commits viewable in compare view

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[dependabot[bot]]

Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.

[dependabot[bot]]

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.

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