chore(deps): update peter-evans/create-pull-request action to v7

Author: renovate[bot]

.github/workflows/update-demo.yml

@@ -36,7 +36,7 @@ jobs:
             vhs < $t
           done
 
-      - uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c # v6.1.0
+      - uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           title: update docs