Fix actions/setup-python@v4

Author: ankandrew

.github/workflows/main.yaml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ 3.10 ]
+        python-version: [ '3.10' ]
         os: [ ubuntu-latest ]
     runs-on: ${{ matrix.os }}
     steps: