update cache directories

[152334H]

Please provide a high-level explanation of what this pull request is for.

Pwntools uses ~/.cache/.pwntools-cache* now, not ~/.pwntools-cache?

After creating your Pull Request, please add and push a commit that updates the changelog for the appropriate branch.

Doing PR to verify that I'm not missing something obvious

[zachriggle]

This will cause everybody who put never in the update file to have to re-do that step 😢

[152334H]

Will it? It was my impression that people using ~/.pwntools-cache-* already had life broken for them...

[zachriggle]

Putting the "disable" file inside of the pwntools CACHE directory was probably a bad move in the first place.

I must have missed that change :(

[Arusekk]

This change is reflecting in the documentation what was already present from #1420 and before.