changelog: add requests retry when receiving ErrGPRCNotSupportedForLearner

[sheyt0]

changelog update for PRs #17641 and #17692.

[k8s-ci-robot]

Hi @sheyt0. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ahrtr]

/ok-to-test

[jmhbnz]

Apologies I hit merge seeing the merge-when-tests-green label but I just noticed the two backports in question are still open. Will double check tomorrow that the backports have merged, it should be no problem.