chore(deps-dev): bump undici from 7.12.0 to 7.15.0 (#613)

Bumps [undici](https://github.com/nodejs/undici) from 7.12.0 to 7.15.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v7.12.0...v7.15.0)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 7.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -81,7 +81,7 @@
     "tsx": "4.20.3",
     "typescript": "5.8.3",
     "typescript-eslint": "8.38.0",
-    "undici": "7.12.0",
+    "undici": "7.15.0",
     "vite": "6.2.7",
     "vitest": "3.2.4",
     "wrangler": "^4.13.2"