Update GitHub Actions to latest versions

Upgraded actions/checkout to v4, setup-python to v5, and codecov-action to v4 in the python-package workflow. These updates ensure better compatibility and performance with newer GitHub Actions APIs.

.github/workflows/python-package.yml

@@ -19,9 +19,9 @@ jobs:
         python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -42,6 +42,6 @@ jobs:
       run: |
         pytest --cov tests
     - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}