Fix CI pip cache path for requirements-dev.txt

Author: tyvsmith

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           cache: pip
+          cache-dependency-path: requirements-dev.txt
 
       - name: Install dev dependencies
         run: pip install -r requirements-dev.txt