fix(ci): Specify create-pull-request correctly

Specifying a ref with `@` is required.

Signed-off-by: Erik Swanson <erik@retailnext.net>

Author: eriksw

.github/workflows/update.yaml

@@ -63,7 +63,7 @@ jobs:
           private_key: ${{ secrets.APP_PRIVATE_KEY }}
       - name: Create Pull Request
         id: create-pull-request
-        uses: peter-evans/create-pull-request
+        uses: peter-evans/create-pull-request@v7
         if: ${{ steps.update.outputs.commit-message }}
         with:
           token: ${{ steps.generate-token.outputs.token }}