Update Codecov workflow for Python setup and actions

Author: chenxinye

.github/workflows/codecov.yml

@@ -1,31 +1,33 @@
 name: Workflow for Codecov
+
 on: [push]
 
 jobs:
   run:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest] # macos-latest, windows-latest
-    env:
-      OS: ${{ matrix.os }}
-      PYTHON: '3.12'
+        os: [ubuntu-latest, windows-latest]
+
     steps:
-    - uses: actions/checkout@master
-    - name: Setup Python
-      uses: actions/setup-python@master
-      with:
-        python-version: 3.12
-    - name: Generate coverage report
-      run: |
-        pip install -r requirements.txt
-        pip install -U scikit-learn
-        pip install pytest-cov
-        pip install build
-        pip install setuptools 
-        python setup.py build_ext --inplace
-        pytest tests/unittests.py --cov=classix
-        coverage xml
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v2
+      - uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt
+          pip install -U scikit-learn
+          pip install pytest pytest-cov coverage setuptools
+          pip install .
+
+      - name: Run tests with coverage
+        run: |
+          pytest tests/unittests.py --cov=classix
+          coverage xml
 
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4