fix: Simulation is not deterministic due to GenSignedMockTx (backport #12374)

[mergify]

This is an automatic backport of pull request #12374 done by Mergify.
Cherry-pick of 17dc431 has failed:

On branch mergify/bp/release/v0.45.x/pr-12374
Your branch is up to date with 'origin/release/v0.45.x'.

You are currently cherry-picking commit 17dc43166.
  (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:   x/distribution/simulation/operations.go
	modified:   x/staking/simulation/operations.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   simapp/helpers/test_helpers.go
	both modified:   simapp/test_helpers.go
	both modified:   x/authz/simulation/operations.go
	both modified:   x/bank/simulation/operations.go
	both modified:   x/genutil/gentx_test.go
	both modified:   x/gov/simulation/operations.go
	deleted by us:   x/group/simulation/operations.go
	deleted by us:   x/nft/simulation/operations.go
	both modified:   x/simulation/util.go
	both modified:   x/slashing/simulation/operations.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]

@Muggle-Du do you think you could address merge conflicts here?

[adu-web3]

@Muggle-Du do you think you could address merge conflicts here?

@alexanderbez sure, I can handle this

[adu-web3]

@alexanderbez but it seems I have no permissions to commit to mergify/bp/release/v0.45.x/pr-12374, can you help me with this?