Use Python 3.10 in tests

Author: flashcode

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: "3.10"
       - name: Install dependencies
         run: pip install weechat-script-lint
       - name: Check scripts