Update mime dependency to 4.0

[WillTaylorDev]

Javascript files should have content type as text/javascript.
jshttp/mime-db#194 (comment)

• Tests
  • Tests included
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• Public documentation
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  • Documentation not necessary because: n/a
• Wrangler V3 Backport
  • Wrangler PR:
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🦋 Changeset detected

Latest commit: 87584ce

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@cloudflare/workers-shared	Patch

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commit: 87584ce