.github: Bump peter-evans/create-pull-request from 4.1.4 to 4.2.4

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 4.1.4 to 4.2.4.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](https://github.com/peter-evans/create-pull-request/compare/ad43dccb4d726ca8514126628bec209b8354b6dd...38e0b6e68b4c852a5500a94740f0e535e0d7ba54)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/update-flake.yml

@@ -35,7 +35,7 @@ jobs:
           private_key: ${{ secrets.LICENSING_APP_PRIVATE_KEY }}
 
       - name: Send pull request
-        uses: peter-evans/create-pull-request@ad43dccb4d726ca8514126628bec209b8354b6dd #v4.1.4
+        uses: peter-evans/create-pull-request@38e0b6e68b4c852a5500a94740f0e535e0d7ba54 #v4.2.4
         with:
           token: ${{ steps.generate-token.outputs.token }}
           author: Flakes Updater <noreply@tailscale.com>