CI: remove unused dep

Author: MuellerSeb

.github/workflows/main.yml

@@ -76,7 +76,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install build coveralls>=3.0.0
+          pip install build
           pip install --editable .[test]
 
       - name: Run tests