Use the latest Python 3.10 prerelease

Author: agronholm

.github/workflows/codeqa-test.yml

@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.6, 3.7, 3.8, 3.9, 3.10.0-alpha.5]
+        python-version: [3.6, 3.7, 3.8, 3.9, 3.10-dev]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2