Fix Prettier formatting in .github/actions/build-vsix/action.yml

Agent-Logs-Url: https://github.com/microsoft/vscode-python/sessions/ddae7324-a3ac-48a8-a765-612319ecb9e6

Co-authored-by: rzhao271 <7199958+rzhao271@users.noreply.github.com>

Author: Copilot

.github/actions/build-vsix/action.yml

@@ -34,7 +34,7 @@ runs:
     - name: Use Python 3.10 for JediLSP
       uses: actions/setup-python@v6
       with:
-        python-version: "3.10"
+        python-version: '3.10'
         cache: 'pip'
         cache-dependency-path: |
           requirements.txt