fix standalone coverage checks for version bumps (#938)

.github/workflows/ci.yml

@@ -149,7 +149,7 @@ jobs:
         run: |
           min_versions=$(sed ${{ matrix.type }}/*requirements.txt -e 's/[~>]=\([0-9]\)/==\1/')
           python -m pip install --upgrade pip
-          pip install ${{ matrix.dependencies }} $min_versions
+          pip install -e ./checks-superstaq ${{ matrix.dependencies }} $min_versions
       - name: Coverage check
         run: |
           checks/coverage_.py ${{ matrix.type }}