The important metric is project coverage (zarr-developers#3351)

Make patch coverage informational, so that fixing a typo in a line
that raises an exception (typically not covered by a test) passes CI.

Co-authored-by: Davis Bennett <[email protected]>

Author: DimitriPapadopoulos

codecov.yml

@@ -3,6 +3,7 @@ coverage:
     patch:
       default:
         target: auto
+        informational: true
     project:
       default:
         target: auto