chore: Upload codecov

Author: fsbraun

.github/workflows/codecov.yml

@@ -45,11 +45,7 @@ jobs:
     - name: Generate XML report
       run: |
         coverage xml
-    - name: Upload coverage artifact (for CI consumption)
-      uses: actions/upload-artifact@v4
+    - name: Upload Coverage to Codecov
+      uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7
       with:
-        name: coverage-xml-${{ matrix.python-version }}-${{ matrix.requirements-file }}
-        path: coverage.xml
-    # If you need to upload to Codecov, prefer their minimal uploader binary or pin the action by SHA.
-    # Upload to Codecov is intentionally omitted here to avoid unpinned third-party actions.
-
+        token: ${{ secrets.CODECOV_TOKEN }}