Update actions 3.

Author: frjo

.github/workflows/pages.yaml

@@ -16,6 +16,10 @@ concurrency:
   group: pages
   cancel-in-progress: true
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -29,6 +33,9 @@ jobs:
           hugo-version: "latest"
           extended: true
 
+      - name: Install Dart Sass
+        run: sudo snap install dart-sass
+
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5