chore: prevent empty commit when no changes to manifest.json

Author: cloudbr34k84

.github/workflows/update-version.yml

@@ -30,5 +30,5 @@ jobs:
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add custom_components/ha_pocketsmith/manifest.json
-          git commit -m "chore: bump version to ${GITHUB_REF_NAME}"
+          git diff --staged --quiet || git commit -m "chore: bump version to ${GITHUB_REF_NAME}"
           git push