ci: fix pipeline failures by updating actions and adding missing dependencies

- Updated setup-python to v5, upload-artifact to v4, and codecov to v4 to resolve deprecation failures.
- Added explicit installation of 'pytest-cov' in the test job.
- Switched to newer versions of core GitHub Actions for better reliability.

Author: sl4m3

.github/workflows/minimal-ci.yml

@@ -25,14 +25,15 @@ jobs:
         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 }}
           cache: 'pip'
 
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          pip install pytest-cov
           pip install -e ".[dev]"
 
       - name: Run tests
@@ -42,7 +43,7 @@ jobs:
           PYTHONPATH: src
 
       - name: Upload coverage
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         if: matrix.python-version == '3.11'
         with:
           files: ./coverage.xml
@@ -59,7 +60,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -121,7 +122,7 @@ jobs:
           EOF
 
       - name: Upload security reports
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: security-reports
@@ -166,7 +167,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
           cache: 'pip'
@@ -199,7 +200,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.11'
           cache: 'pip'