Bump fast-uri from 3.0.5 to 3.1.2 in /extensions/copilot (#315358)

Bumps [fast-uri](https://github.com/fastify/fast-uri) from 3.0.5 to 3.1.2.
- [Release notes](https://github.com/fastify/fast-uri/releases)
- [Commits](https://github.com/fastify/fast-uri/compare/v3.0.5...v3.1.2)

---
updated-dependencies:
- dependency-name: fast-uri
  dependency-version: 3.1.2
  dependency-type: indirect
...

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Co-authored-by: Raymond Zhao <7199958+rzhao271@users.noreply.github.com>