Fix dangling references for validate_zarr/v0.6/core/invalid/image tests - #24

Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.12.3-c0e1b641a2c2b74459fc09a99578162a933b79b64675f585d3e203a56b98b260, another job may be creating this cache.