Update codecov/codecov-action digest to ab904c4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -191,7 +191,7 @@ jobs:
         run: make -j2 test
 
       - name: Publish Unit Test Coverage
-        uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # v3
+        uses: codecov/codecov-action@ab904c41d6ece82784817410c45d8b8c02684457 # v3
         with:
           flags: unittests
           file: _output/tests/linux_amd64/coverage.txt