fixup! github-actions: add codecov upload

Author: miri64

setup.cfg

@@ -2,7 +2,7 @@
 addopts = -v --junit-xml=test-report.xml
           --doctest-modules
           --cov=riotctrl --cov-branch
-          --cov-report=term --cov-report=term-missing --cov-report=xml
+          --cov-report=term-missing --cov-report=xml
 testpaths = riotctrl
 markers =
     rapidjson