fix: tools installed via cargo:a/b@rev:012 immediately pruned

[roele]

Fixes #2583

@jdx First thought i had was, why not setting the ref: in the TOML file but the cargo tool could not infer the type for installation. So i guess we're stuck with mapping these prefixes back and forth, or do you have any other ideas?

A a small side-effect Version/Requested will differ but that is not unusual as it already does for latest.

mise-debug ls
Tool                     Version                           Config Source               Requested                      
cargo:eza-community/eza  ref:a3b0c8b40ed1f4f1a12c23242bbe  ~/Downloads/mise/.mise.toml rev:a3b0c8b40ed1f4f1a12c23242bb
                         780c391812f3                                                  e780c391812f3                  
cargo:eza-community/eza  ref:main                                                                                     
cargo:eza-community/eza  ref:v0.20.0                                                                                  
go                       1.23.1                            ~/.config/mise/config.toml  latest