Bump peter-evans/create-pull-request from 3.8.2 to 3.9.1

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 3.8.2 to 3.9.1.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v3.8.2...v3.9.1)

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

.github/workflows/spec_update.yml

@@ -62,7 +62,7 @@ jobs:
           python generate_routes.py
           cd ..
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3.8.2
+        uses: peter-evans/create-pull-request@v3.9.1
         if: steps.git-diff-num.outputs.num-diff != 0
         with:
           token: ${{ secrets.SPEC_UPDATE_TOKEN }}