Bump peter-evans/create-pull-request from 3 to 6

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 3 to 6.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v3...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/format_pr.yml

@@ -15,7 +15,7 @@ jobs:
       # https://github.com/peter-evans/create-pull-request#reference-example
       - name: Create Pull Request
         id: cpr
-        uses: peter-evans/create-pull-request@v3
+        uses: peter-evans/create-pull-request@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: Format .jl files