Update sync-readme.yml (#386)

Author: GioF71

.github/workflows/sync-readme.yml

@@ -22,7 +22,7 @@ jobs:
           slug: ${{ secrets.DOCKER_USERNAME }}/upmpdcli
           readme: ./README.md
       - name: Update repo description
-        uses: peter-evans/dockerhub-description@v3
+        uses: peter-evans/dockerhub-description@v4
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}