Dependency on old version of kapp-controller, ytt should be removed

[jorgemoralespou]

When using kapp as library it adds:

• kapp-controller's old version as indirect dependency because of this line https://github.com/carvel-dev/kapp/blob/develop/go.mod#L19
• ytt old version as indirect dependency because of this line https://github.com/carvel-dev/kapp/blob/develop/go.mod#L13

What did you expect:
kapp-controller depends on kapp, and so kapp should not depend on kapp-controller.
Dependency on ytt and other libs should be upgraded so that they ingest carvel.dev instead

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[100mik]

We should bump the ytt dependency. It is mainly used for ytt rebase rules.

The deal with kapp however is a bit different, kapp is consumed by kapp-controller as a binary, kapp just has a dependency on kapp-controller because it imports some types (pkgi/app primarily) to have some specific behaviour for these resources. But yep, it should be bumped if out of date 🙏🏼