ci: remove codecov

Author: Otto-AA

.github/workflows/main.yml

@@ -35,9 +35,4 @@ jobs:
       run: make check
 
     - name: Test code
-      run: make test
-
-    - name: Upload coverage
-      uses: codecov/codecov-action@v3
-      with:
-        fail_ci_if_error: true
+      run: make test