CI: disable codecov/patch

Testing the code coverage of individual commits is unnecessary at
this point in time. Let's rely on codecov/project only, which measures
overall project coverage.

Signed-off-by: Renato Westphal <[email protected]>

Author: rwestphal

codecov.yml

@@ -0,0 +1,7 @@
+coverage:
+  status:
+    project:
+      default:
+        threshold: 10%
+    patch: off
+    changes: no