Update peter-evans/create-pull-request action to v7 (#202)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/compress-images.yml

@@ -48,7 +48,7 @@ jobs:
         if: |
           github.event_name != 'pull_request' &&
           steps.calibre.outputs.markdown != ''
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           title: Auto Compress Images