Bump peter-evans/create-pull-request from 6 to 7

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 6 to 7.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v6...v7)

---
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/sync-project-branch.yml

@@ -17,7 +17,7 @@ jobs:
           git config user.email "[email protected]"
           git config user.name "Sync project branch action"
           git merge --no-edit origin/master
-      - uses: peter-evans/create-pull-request@v6
+      - uses: peter-evans/create-pull-request@v7
         with:
           title: Merge remote-tracking branch `origin/master` into `gsoc-2023-project`
           branch: sync-project-branch