*: 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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.74%. Comparing base (4506d63) to head (05f37d4).
Report is 1 commits behind head on release-6.5.

❗ Current head 05f37d4 differs from pull request most recent head 07f7368. Consider uploading reports for the commit 07f7368 to get more accurate results

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #7886      +/-   ##
===============================================
+ Coverage        75.49%   75.74%   +0.24%     
===============================================
  Files              332      332              
  Lines            33775    33775              
===============================================
+ Hits             25499    25582      +83     
+ Misses            6070     6007      -63     
+ Partials          2206     2186      -20     

Flag	Coverage Δ
unittests	75.74% <100.00%> (+0.24%)	⬆️

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[HuSharp]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 05f37d4