Fix Lint CI failure: update Python from 3.9 to 3.10 in lint action

Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/f9c1a42b-75e8-4e00-ab05-0b914b999dbe

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

Author: Copilot

.github/actions/lint/action.yml

@@ -30,7 +30,7 @@ runs:
     - name: Install Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.9'
+        python-version: '3.10'
 
     - name: Pip cache
       uses: actions/cache@v4