feat!: bump ICS to v6.1.0 (backport #3350)

[mergify]

Description

Closes: #XXXX

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• Included the correct type prefix in the PR title
• Added ! to the type prefix if API, client, or state breaking change (i.e., requires minor or major version bump)
• Targeted the correct branch (see PR Targeting)
• Provided a link to the relevant issue or specification
• Followed the guidelines for building SDK modules
• Included the necessary unit and integration tests
• Added a changelog entry in .changelog (for details, see contributing guidelines)
• Included comments for documenting Go code
• Updated the relevant documentation or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage

---

This is an automatic backport of pull request #3350 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3ce3c5b has failed:

On branch mergify/bp/release/v20.x/pr-3350
Your branch is up to date with 'origin/release/v20.x'.

You are currently cherry-picking commit 3ce3c5b.
  (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:   go.mod
	modified:   go.sum

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both deleted:    .changelog/unreleased/features/3335-bump-ics.md
	deleted by them: .changelog/v20.0.0/api-breaking/3335-bump-ics.md
	added by them:   .changelog/v20.0.0/api-breaking/3350-bump-ics.md
	deleted by them: .changelog/v20.0.0/dependencies/3335-bump-ics.md
	added by them:   .changelog/v20.0.0/dependencies/3350-bump-ics.md
	added by us:     .changelog/v20.0.0/features/3335-bump-ics.md
	added by them:   .changelog/v20.0.0/features/3350-bump-ics.md
	deleted by them: .changelog/v20.0.0/state-breaking/3335-bump-ics.md
	added by them:   .changelog/v20.0.0/state-breaking/3350-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