Move Go 1.21 update to breaking changes section of the release notes.

[cmacknz]

This update obsoletes support for Windows 8.1.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @cmacknz? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[kilfoyle]

LGTM!

[elasticmachine]

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• Start Time: 2024-01-17T20:31:29.667+0000

• Duration: 11 min 27 sec

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