Bump peter-evans/create-pull-request from 4 to 5 (Lightning-AI#17313)

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 4 to 5.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v4...v5)

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

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

Author: dependabot[bot]

.github/workflows/_legacy-checkpoints.yml

@@ -139,7 +139,7 @@ jobs:
       run: echo ${{ needs.create-legacy-ckpts.outputs.pl-version }} >> ${{ env.legacy_dir }}/back-compatible-versions.txt
 
     - name: Create Pull Request
-      uses: peter-evans/create-pull-request@v4
+      uses: peter-evans/create-pull-request@v5
       with:
         title: Adding test for legacy checkpoint created with ${{ needs.create-legacy-ckpts.outputs.pl-version }}
         delete-branch: true