Bump peter-evans/create-pull-request from 5 to 6

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 5 to 6.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v5...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/watch-dependencies.yaml

@@ -97,7 +97,7 @@ jobs:
 
       # ref: https://github.com/peter-evans/create-pull-request
       - name: Create a PR
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         # Don't try open PRs in forks or when the job is triggered by a push to
         # a branch other than the default branch.
         if: github.repository == 'jupyterhub/mybinder.org-deploy' && (github.event_name != 'push' || github.ref == 'refs/heads/main')
@@ -230,7 +230,7 @@ jobs:
 
       # ref: https://github.com/peter-evans/create-pull-request
       - name: Create a PR
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         # Don't try open PRs in forks or when the job is triggered by a push to
         # a branch other than the default branch.
         if: github.repository == 'jupyterhub/mybinder.org-deploy' && (github.event_name != 'push' || github.ref == 'refs/heads/main')