GHA: update workflow to use python3.10

Author: tacaswell

Diff for: .github/workflows/main.yaml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.10
       - name: Install dependencies
         run: |
           sudo apt update