docs(CHANGELOG): update 3.4/3.5 changelog with defrag close fix

[ghouscht]

See https://github.com/etcd-io/etcd/issues/18841 for details.

• 3.4: https://github.com/etcd-io/etcd/pull/18855
• 3.5 https://github.com/etcd-io/etcd/pull/18854

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Hi @ghouscht. Thanks for your PR.

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All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

[see 19 files with indirect coverage changes](https://app.codecov.io/gh/etcd-io/etcd/pull/18856/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) ```diff @@ Coverage Diff @@ ## main #18856 +/- ## ======================================= Coverage 68.73% 68.73% ======================================= Files 420 420 Lines 35531 35531 ======================================= + Hits 24422 24424 +2 + Misses 9683 9676 -7 - Partials 1426 1431 +5 ``` ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/etcd-io/etcd/pull/18856?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/etcd-io/etcd/pull/18856?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Last update [b125409...07fe745](https://app.codecov.io/gh/etcd-io/etcd/pull/18856?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None).

[ahrtr]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ghouscht, ivanvc

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