🧪💅 Disable GH annotations in Codecov

They are being deprecated and can get annoying pretty quickly due to
no way to hide them programmatically.

Refs:
- pytest-dev/pytest#13092
- python-trio/trio#3153

Author: webknjaz

.codecov.yml

@@ -46,4 +46,7 @@ coverage:
         - MyPy
         target: 100%
 
+github_checks:
+  annotations: false
+
 ...