fix: remove unsupported -y flag from uv pip uninstall fallback

uv pip uninstall does not support the -y (assume-yes) flag. Remove it
from the uv fallback argv while keeping it for the python -m pip
uninstall path.

Reported-by: chengyongru

tests/cli_apps/test_service.py

@@ -843,6 +843,5 @@ def test_uninstall_uses_uv_pip_when_pip_unavailable(
         "uninstall",
         "--python",
         sys.executable,
-        "-y",
         "suno-cli",
     ]