Update tests.yml

Author: benjym

.github/workflows/tests.yml

@@ -35,12 +35,8 @@ jobs:
         coverage xml
         coverage report
     
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v4
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v5
       with:
-        file: ./coverage.xml
-        flags: unittests
-        name: codecov-umbrella
-        fail_ci_if_error: false
-      env:
-        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        token: ${{ secrets.CODECOV_TOKEN }}
+        slug: scigem/PynamiX