Bump undici from 6.3.0 to 6.4.0

Bumps [undici](https://github.com/nodejs/undici) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.3.0...v6.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -56,7 +56,7 @@
     "@actions/exec": "^1.1.1",
     "@actions/github": "^6.0.0",
     "@actions/io": "^1.1.3",
-    "undici": "^6.3.0"
+    "undici": "^6.4.0"
   },
   "devDependencies": {
     "@octokit/types": "^12.4.0",