refactor(registry): use aqua for slsa-verifier

[scop]

No description provided.

[jdx]

I think because aqua depends on slsa-verifier this is causing an endless loop

[scop]

Hm, from https://aquaproj.github.io/docs/reference/security/cosign-slsa/

You don't have to install Cosign and slsa-verifier, because aqua installs Cosign automatically and slsa-verifier is embedded to aqua as Go library.

...but IDK if that's relevant as I believe mise reimplements aqua registry support itself.

[scop]

Anyway mise use -g aqua:slsa-framework/slsa-verifier works for me.