Update unit_test.yaml codecov step (#225)

Signed-off-by: Todd Ekenstam <[email protected]>

Author: tekenstam

.github/workflows/unit_test.yaml

@@ -27,7 +27,9 @@ jobs:
         run: |
           make test
 
-      - name: Upload to Codecov
+      - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v4
         with:
-          file: ./coverage.txt
+          files: ./coverage.out
+          token: ${{ secrets.CODECOV_TOKEN }}
+