chore(deps): bump peter-evans/dockerhub-description from 3 to 4 (#610)

Author: dependabot[bot]

.github/workflows/markdown.yml

@@ -37,7 +37,7 @@ jobs:
           use-quiet-mode: yes
           config-file: .github/workflows/configs/mlc-config.json
 
-      - uses: peter-evans/dockerhub-description@v3
+      - uses: peter-evans/dockerhub-description@v4
         if: github.repository == 'qdm12/ddns-updater' && github.event_name == 'push'
         with:
           username: qmcgaw