chore: renaming ica migrations handler pkg version (backport #2355)

[mergify]

This is an automatic backport of pull request #2355 done by Mergify.
Cherry-pick of 1dca3b0 has failed:

On branch mergify/bp/release/v6.0.x/pr-2355
Your branch is up to date with 'origin/release/v6.0.x'.

You are currently cherry-picking commit 1dca3b0.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	deleted:    modules/apps/27-interchain-accounts/controller/migrations/v5/migrations_test.go
	renamed:    modules/apps/27-interchain-accounts/controller/migrations/v5/migrations.go -> modules/apps/27-interchain-accounts/controller/migrations/v6/migrations.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   modules/apps/27-interchain-accounts/controller/migrations/v6/migrations_test.go

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[damiannolan]

I think these changes are included in #2364. Either way I think that PR should be merged first and can follow up here after