cacert: Drop python3Minimal
cacert: Drop python3Minimal

This PR, https://github.com/NixOS/nixpkgs/pull/176291, started building
`cacert` with `python3Minimal` to work around an infinite recursion
problem with the `mailcap` build.

This causes problems now because `buildcatrust` requires the `_scproxy`
module and that's not built for `python3Minimal` on Darwin. This causes
many transitive failures. Simply building `cacert` with `python3` seems
to work fine.

The `mailcap` expression has since been altered and this infinite
recursion issue doesn't reappear.

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