Menagerie: Earth Mob Variants and More!

- Made minor adaptations to texture mapping of horned cows which used the "cold" cow model to match the changes from 25w10a. This doesn't seem to affect their appearance in game, but this might be a bug which could be fixed in future releases, so preemptive changes were needed.
- Changed the minimum data and resourcepack format requirements to match the latest of 1.21.5 Pre-release 2.