Makes codecov-action optional

We do not want to fail the job if codecov fails
to upload the report due to rate limiting.

Signed-off-by: Mikalai Radchuk <[email protected]>

Author: Mikalai Radchuk

.github/workflows/go.yaml

@@ -33,7 +33,6 @@ jobs:
     - uses: codecov/codecov-action@v3
       with:
         files: cover.out
-        fail_ci_if_error: true
         functionalities: fixes
 
   go-apidiff: