ci: replaced python_version matrix var with python-version-file: pyproject.toml

Author: ErikBjare

.github/workflows/build.yml

@@ -17,15 +17,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        python_version: [3.9]
     steps:
     - uses: actions/checkout@v3
       with:
         submodules: 'recursive'
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python_version }}
+        python-version-file: pyproject.toml
     - name: Install dependencies
       shell: bash
       run: |
@@ -58,15 +57,14 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python_version: [3.9]
     steps:
     - uses: actions/checkout@v3
       with:
         submodules: 'recursive'
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python_version }}
+        python-version-file: pyproject.toml
     - name: Install dependencies
       shell: bash
       run: |

.github/workflows/lint.yml

@@ -12,11 +12,15 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
+        with:
+          python-version-file: pyproject.toml
       - uses: jpetrucciani/ruff-check@main
 
   format:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
+        with:
+          python-version-file: pyproject.toml
       - uses: psf/black@stable