ci: enable uv cache in some jobs

Author: ciffelia

.github/workflows/ci.yaml

@@ -18,8 +18,6 @@ jobs:
           persist-credentials: false
 
       - uses: astral-sh/setup-uv@v7
-        with:
-          enable-cache: false
 
       - run: uv run demo.py
 
@@ -31,8 +29,6 @@ jobs:
           persist-credentials: false
 
       - uses: astral-sh/setup-uv@v7
-        with:
-          enable-cache: false
 
       - run: uv build --no-sources