Containers-shared: Remove undici dependency

[IRCody]

As far as I can tell undici is un-used anywhere by containers or cloudchamber so is safe to just remove.

• Tests
  • Tests included
  • Tests not necessary because: Removing unused depdency
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: Not externally visible behavior changes
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: packages doesn't exist in v3

[changeset-bot]

🦋 Changeset detected

Latest commit: e8bab5a

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

This PR includes changesets to release 1 package

Name	Type
@cloudflare/containers-shared	Patch

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commit: e8bab5a