Update vint.yml (preservim#865)

It looks like the vint package is not correct with python 3.12.  Need to test with a different python version.

Author: raven42

.github/workflows/vint.yml

@@ -8,7 +8,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - name: Setup dependencies
         run: pip install vim-vint
       - name: Lint Vimscript