ci: remove python 3.9 mypy because of click dependency

Author: makkus

.github/workflows/build-linux.yaml

@@ -65,7 +65,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python_version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python_version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: "Set up Python ${{ matrix.python_version }}"
         uses: actions/setup-python@v5