CHANGELOG: Add release date of etcd v3.5.17

[ghouscht]

Adding the release date to the changelog as discussed during the release meeting.

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

[k8s-ci-robot]

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[ghouscht]

/assign @ivanvc

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

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[jmhbnz]

/retitle CHANGELOG: Add release date of etcd v3.5.17

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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