chore(store): upgrade iavl to v0.19.0 (backport #12626)

[mergify]

closes: #12682

This is an automatic backport of pull request #12626 done by Mergify.
Cherry-pick of 6f63115 has failed:

On branch mergify/bp/release/v0.45.x/pr-12626
Your branch is up to date with 'origin/release/v0.45.x'.

You are currently cherry-picking commit 6f631156f.
  (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/iavl/store.go
	modified:   store/iavl/store_test.go
	modified:   store/iavl/tree_test.go
	modified:   store/rootmulti/proof_test.go
	modified:   store/rootmulti/store.go
	modified:   store/types/iterator_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	deleted by us:   UPGRADING.md
	both modified:   go.mod
	both modified:   go.sum
	both modified:   store/iavl/tree.go
	deleted by us:   store/tools/ics23/go.mod
	deleted by us:   store/tools/ics23/iavl/cmd/testgen-iavl/main.go
	deleted by us:   store/tools/ics23/iavl/create.go
	deleted by us:   store/tools/ics23/iavl/create_test.go
	deleted by us:   store/tools/ics23/iavl/helpers/helpers.go

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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[alexanderbez]

@p0mvn any chance you could help me push this over the finish line?

[p0mvn]

@alexanderbez this is good to go