build(deps)!: bump ICS to v6.3.0 (backport #3395)

[mergify]

Description

Closes: #XXXX

Note that the change is not state breaking. See here the changes between ICS v6.2.0 and v6.2.2.

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• Included the correct type prefix in the PR title
• Targeted the correct branch (see PR Targeting)
• Provided a link to the relevant issue or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed

Reviewers Checklist

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I have...

• Confirmed the correct type prefix in the PR title
• Confirmed all author checklist items have been addressed
• Confirmed that this PR does not change production code

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This is an automatic backport of pull request #3395 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 210618b has failed:

On branch mergify/bp/release/v21.x/pr-3395
Your branch is up to date with 'origin/release/v21.x'.

You are currently cherry-picking commit 210618b.
  (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:   app/upgrades/v20/upgrades_test.go
	modified:   go.mod
	modified:   go.sum

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: .changelog/v21.0.0/dependencies/3385-bump-ics.md
	added by them:   .changelog/v21.0.0/dependencies/3395-bump-ics.md
	deleted by them: .changelog/v21.0.0/state-breaking/3385-bump-ics.md
	added by them:   .changelog/v21.0.0/state-breaking/3395-bump-ics.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally