Bump Iceberg to v1.6.1

[regadas]

We can't bump to v1.7.0 as java 8 support was dropped.

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[regadas]

assign set of reviewers

[github-actions]

Assigning reviewers. If you would like to opt out of this review, comment assign to next reviewer:

R: @robertwb for label java.
R: @johnjcasey for label io.

Available commands:

• stop reviewer notifications - opt out of the automated review tooling
• remind me after tests pass - tag the comment author after tests pass
• waiting on author - shift the attention set back to the author (any comment or push by the author will return the attention set to the reviewers)

The PR bot will only process comments in the main thread (not review comments).

[github-actions]

Reminder, please take a look at this pr: @robertwb @johnjcasey

[github-actions]

Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

R: @Abacn for label java.
R: @ahmedabu98 for label io.

Available commands:

• stop reviewer notifications - opt out of the automated review tooling
• remind me after tests pass - tag the comment author after tests pass
• waiting on author - shift the attention set back to the author (any comment or push by the author will return the attention set to the reviewers)

[ahmedabu98]

Hey @regadas, thanks for making this change!

Can you please resolve the conflicts and trigger the Iceberg integration tests by modifying this file

[regadas]

Hi @ahmedabu98 thanks for taking a look! let me know if smth else is missing

[ahmedabu98]

Looks good! Out of curiosity, what motivated this version upgrade?

[regadas]

@ahmedabu98 I was not hitting any particular issue in specific. Trying to keep things updated since between 1.4.3 and 1.6.1, parquet support, table scan's have been improved and there's some spec additions.

[ahmedabu98]

Sounds good 👍🏽 merging now.

Thanks for tagging me on your other PRs, I'll take a look at them later today. Can you resolve their conflicts and similarly trigger the integration tests too?