fix: deprecate AllowUpdateAfter...check (backport #1511)

[mergify]

This is an automatic backport of pull request #1511 done by Mergify.
Cherry-pick of 5e5e2cd has failed:

On branch mergify/bp/release/v1.5.x/pr-1511
Your branch is up to date with 'origin/release/v1.5.x'.

You are currently cherry-picking commit 5e5e2cd.
  (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:   docs/architecture/adr-026-ibc-client-recovery-mechanisms.md
	modified:   docs/ibc/proto-docs.md
	modified:   modules/light-clients/07-tendermint/types/proposal_handle.go
	modified:   modules/light-clients/07-tendermint/types/proposal_handle_test.go
	modified:   proto/ibc/lightclients/tendermint/v1/tendermint.proto

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   docs/ibc/proposals.md
	both modified:   modules/light-clients/07-tendermint/types/tendermint.pb.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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