build(deps): Bump cosmossdk.io/x/tx from 0.11.0 to 0.12.0 (backport #5017)

[mergify]

This is an automatic backport of pull request #5017 done by Mergify.
Cherry-pick of 52e7176 has failed:

On branch mergify/bp/release/v8.0.x/pr-5017
Your branch is up to date with 'origin/release/v8.0.x'.

You are currently cherry-picking commit 52e7176e.
  (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)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   e2e/go.mod
	deleted by us:   e2e/go.sum
	both modified:   go.mod
	both modified:   go.sum
	both modified:   modules/apps/callbacks/go.mod
	both modified:   modules/apps/callbacks/go.sum

no changes added to commit (use "git add" and/or "git commit -a")

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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