Bump python version so linter works again (#398)

Author: jez

.github/workflows/vint.yml

@@ -7,9 +7,9 @@ jobs:
     - name: Checkout
       uses: actions/checkout@master
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: '3.10'
     - name: Setup dependencies
       run: pip install vim-vint
     - name: Run Vimscript Linter