update actions/cache to v5

I've started getting warnings from GitHub actions about actions/cache being outdated. I believe they're caused by this action, which uses actions/cache@v4. The latest version of actions/cache is currently v5.0.5 .

https://github.com/humbletim/setup-vulkan-sdk/blob/c25f41106918cde0bf347e6f201277392b3a9e9d/action.yml#L68