chore: bump c8 from 11.0.0 to 12.0.0 (#425)

Bumps [c8](https://github.com/bcoe/c8) from 11.0.0 to 12.0.0.
- [Release notes](https://github.com/bcoe/c8/releases)
- [Changelog](https://github.com/bcoe/c8/blob/main/CHANGELOG.md)
- [Commits](bcoe/c8@v11.0.0...v12.0.0)

---
updated-dependencies:
- dependency-name: c8
  dependency-version: 12.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -70,7 +70,7 @@
     "@fastify/cookie": "^11.0.1",
     "@fastify/rate-limit": "^11.0.0",
     "@types/node": "^26.0.1",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",
     "neostandard": "^0.13.0",