fixing codecov

Author: MatthewReid854

.github/workflows/codecov.yml

@@ -24,7 +24,9 @@ jobs:
     - name: Generate coverage report
       run: pytest --cov=./ --cov-report=xml
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v4
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       with:
         fail_ci_if_error: true
         verbose: true