ci: allow empty release commit

Author: jakubmikita

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
           replace: "Version: ${{ github.event.inputs.new_version }}"
           include: "${{ secrets.SLUG }}.php"
       - name: Commit version bump
-        run: git commit -am "Version bump"
+        run: git commit --allow-empty -am "Version bump"
       - name: Finish release
         run: git flow release finish ${{ github.event.inputs.new_version }} -m "v${{ github.event.inputs.new_version }}"
       - name: Push develop and tags