Fix: Tests were run twice

The command `hatch run testing:cov` includes running `hatch run testing:test-cov`.

This removes the duplication

Author: hoh

.github/workflows/test-on-droplets-matrix.yml

@@ -41,7 +41,6 @@ jobs:
       - name: Run unit tests
         run: |
           sudo python3 -m pip install hatch hatch-vcs coverage
-          sudo hatch run testing:test-cov
           sudo hatch run testing:cov
 
       - name: Upload coverage reports to Codecov