update gh for unit tests

Author: timvink

.github/workflows/unittests.yml

@@ -7,11 +7,11 @@ jobs:
     strategy:
       matrix: 
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
     steps:
     - uses: actions/checkout@master
     - name: Setup Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@master
       with:
         python-version: ${{ matrix.python-version }}
     - name: Static code checking with pyflakes