Bump peter-evans/create-pull-request from v3.8.2 to v3.9.1 (#306)

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from v3.8.2 to v3.9.1.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](https://github.com/peter-evans/create-pull-request/compare/v3.8.2...d9d6fd980e1e0904e8e4dce3f0992640091bde37)

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

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

.github/workflows/autoprefixer.yml

@@ -21,7 +21,7 @@ jobs:
           npm run autoprefixer
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3.8.2
+        uses: peter-evans/create-pull-request@v3.9.1
         with:
           branch: autoprefixer
           branch-suffix: timestamp