Windows artifact cannot be found

[straight-shoota]

This action tries to load the artifact named crystal from Windows workflow runs on GitHub actions.
Originally, we had only a single compiler build, then another one (called crystal-release). Since crystal-lang/crystal#15000 the non-release build has been removed so the install action fails to find the crystal artifact.

We should either change the name in CI, or change the action to download crystal-release. The former would be preferred as it requires no update to the action.