chore: Unfork iavl (backport #377)

[mergify[bot]]

This is an automatic backport of pull request #377 done by Mergify. Cherry-pick of 65778323dbb502a9d399c9636fbae52f6a3ecaf1 has failed:

On branch mergify/bp/v12.x/pr-377
Your branch is up to date with 'origin/v12.x'.

You are currently cherry-picking commit 65778323d.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
    modified:   store/cache/cache_test.go
    modified:   store/iavl/store.go
    modified:   store/iavl/store_test.go
    modified:   store/iavl/tree.go
    modified:   store/iavl/tree_test.go
    modified:   store/prefix/store_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   go.mod
    both modified:   go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[p0mvn]

@catShaark could you please help with resolving issues here?

[catShaark]

yesss, I'll do this