*: upgrade etcd to v3.4.30 (#7884)

[ti-chi-bot]

This is an automated cherry-pick of #7884

What problem does this PR solve?

Issue Number: close #7904, ref #5520.

• Release note: https://github.com/etcd-io/etcd/releases/tag/v3.4.30
• Code changes are caused by etcd-io/etcd@6de105e.

What is changed and how does it work?

Upgrade etcd to v3.4.30 and adopt the latest code changes.

Check List

Tests

• Unit test
• Integration test

Release note

Upgrade etcd to v3.4.30 to adopt the security patch.

[ti-chi-bot]

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[wuhuizuo]

/label needs-rebase

[ti-chi-bot]

@wuhuizuo: The label(s) needs-rebase cannot be applied. These labels are supported: Hacktoberfest, challenge-program, ci-unstable, compatibility-breaker, high-performance, hptc, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.5, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.5, needs-cherry-pick-release-7.6, release-note, require-LGT1, wontfix, affects-5.4, affects-6.1, affects-6.5, affects-7.1, affects-7.5, affects-7.6, may-affects-5.4, may-affects-6.1, may-affects-6.5, may-affects-7.1, may-affects-7.5, may-affects-7.6.

In response to this:

/label needs-rebase

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[lhy1024]

ci failed

[ti-chi-bot]

PR needs rebase.

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