Build(deps): Bump codecov from 2.1.11 to 2.1.12 (#231)

Author: dependabot-preview[bot]

requirements/ci-wheel.txt

@@ -6,4 +6,4 @@ pytest-cov==2.12.1
 tox==3.24.1
 
 # Using PEP 508 env markers to control dependency on runtimes:
-codecov==2.1.11
+codecov==2.1.12