chore: move go-ozzo/ozzo-validation to invopop/validation

invpop/validation is a fork of go-ozzo/ozzo-validation with some additional
bug fixes. Specifically we need: https://github.com/invopop/validation/pull/1
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f