⬆️ bump peter-evans/create-pull-request from 5.0.2 to 6.0.0

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 5.0.2 to 6.0.0.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v5.0.2...v6.0.0)

---
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/update-upstream.yml

@@ -59,7 +59,7 @@ jobs:
         run: |
           git config --global --add safe.directory "${GITHUB_WORKSPACE}"
       - name: Update content
-        uses: peter-evans/create-pull-request@v5.0.2
+        uses: peter-evans/create-pull-request@v6.0.0
         with:
           base: main
           branch: "oscal-update-${{ github.run_id }}"