remove extra unused argument for codecov action

Author: ronpandolfi

.github/workflows/main.yml

@@ -43,7 +43,6 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           directory: ./coverage/reports/
-          env_vars: OS, PYTHON
           fail_ci_if_error: true
           files: ./coverage.xml
           name: codecov-umbrella