Update .github/workflows/pytest.yaml

Author: schloerke

.github/workflows/pytest.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.12", "3.11", "3.10", "3.9", "3.9"]
+        python-version: ["3.12", "3.11", "3.10", "3.9"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
       fail-fast: false
     defaults: