remove codecov

Author: blink1073

.github/workflows/tests.yml

@@ -43,9 +43,3 @@ jobs:
 
     - name: Build docs
       run: hatch run docs:build
-
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        fail_ci_if_error: true