Fix Install Dart Sass step to download from GitHub releases instead of snap

Agent-Logs-Url: https://github.com/github/github-well-architected/sessions/96d61585-f96c-44b3-a03d-db9e11f66369

Co-authored-by: KittyChiu <42864823+KittyChiu@users.noreply.github.com>

Author: Copilot

.github/workflows/pr-check.yml

@@ -78,7 +78,10 @@ jobs:
           sudo dpkg -i ${{ runner.temp }}/hugo.deb
           hugo version
       - name: Install Dart Sass
-        run: sudo snap install dart-sass
+        run: |
+          curl -LJO https://github.com/sass/dart-sass/releases/download/1.83.4/dart-sass-1.83.4-linux-x64.tar.gz
+          tar -C $RUNNER_TEMP -xzf dart-sass-1.83.4-linux-x64.tar.gz
+          echo "$RUNNER_TEMP/dart-sass" >> $GITHUB_PATH
 
       - uses: actions/setup-node@v6
         with: