[infra] use actions-hugo v3

Author: je-ik

.github/workflows/snapshot.yml

@@ -32,7 +32,7 @@ jobs:
         distribution: "adopt"
         java-version: 11
     - name: Setup Hugo
-      uses: peaceiris/actions-hugo@v2
+      uses: peaceiris/actions-hugo@v3
       with:
         hugo-version: 'latest'
     - name: Deploy snapshot