ci: fixed broken codecov coverage upload

Signed-off-by: Frederic BIDON <[email protected]>

Author: fredbi

.github/workflows/go-test.yml

@@ -52,7 +52,6 @@ jobs:
       uses: codecov/codecov-action@v5
       with:
         files: './coverage-${{ matrix.os }}.${{ matrix.go_version }}.out'
-        flags: '${{ matrix.go_version }}'
-        os: '${{ matrix.os }}'
+        flags: '${{ matrix.go_version }},${{ matrix.os }}'
         fail_ci_if_error: false
         verbose: true