Update CI pipeline commands now we can pip install

While we are updating the pipeline, use latest actions from the
marketplace and test with all currently supported versions of python.

.github/workflows/ci.yml

@@ -12,25 +12,24 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install pytest coverage
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install -e .
     - name: Test with pytest
       run: |
         coverage run -m pytest -v && coverage xml
     - name: Upload coverage to Codecov
-      if: ${{ matrix.python-version == '3.12' }}
-      uses: codecov/codecov-action@v3
+      if: ${{ matrix.python-version == '3.13' }}
+      uses: codecov/codecov-action@v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         fail_ci_if_error: true