remove py 3.8 tests from CI because latest openapi generator is incompatible

Author: bisgaard-itis

.github/workflows/build-python-client.yml

@@ -65,7 +65,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.8, 3.9, 3.10.14]
+        python-version: [3.9, 3.10.14, 3.11]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}