ci: hardcode hugo version to avoid unexpected failures

.gitea/workflows/hugo.yaml

@@ -43,7 +43,7 @@ jobs:
       - name: Setup Hugo
         uses: https://github.com/peaceiris/actions-hugo@v3.0.0
         with:
-          hugo-version: "latest"
+          hugo-version: "0.155.3"
           extended: true
 
       - name: Build website with Hugo