In GHA, remove uv cache, rely on venv cache

Co-authored-by: Copilot <copilot@github.com>

Author: mbjones

.github/workflows/ci.yml

@@ -30,8 +30,6 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          cache: uv
-          cache-dependency-path: uv.lock
 
       - name: Set up uv
         uses: astral-sh/setup-uv@v6