*: upgrade etcd to v3.4.3

[nolouch]

Signed-off-by: nolouch nolouch@gmail.com

What problem does this PR solve?

upgrade etcd to 3.4.3 to fix etcd-io/etcd#10772

What is changed and how it works?

upgrade

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

[overvenus]

make tidy fails.

[nolouch]

/run-all-tests

[codecov-io]

Codecov Report

Merging #1907 into master will decrease coverage by 0.14%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #1907      +/-   ##
==========================================
- Coverage   77.96%   77.82%   -0.15%     
==========================================
  Files         170      170              
  Lines       16875    16879       +4     
==========================================
- Hits        13157    13136      -21     
- Misses       2696     2715      +19     
- Partials     1022     1028       +6

Impacted Files	Coverage Δ
pkg/metricutil/metricutil.go	86.11% <77.77%> (-4.52%)	⬇️
server/api/utiletcdhttpapi.go	80% <0%> (-20%)	⬇️
server/kv/etcd_kv.go	72.72% <0%> (-9.1%)	⬇️
pkg/etcdutil/etcdutil.go	82.6% <0%> (-5.8%)	⬇️
server/api/diagnose.go	60.34% <0%> (-5.18%)	⬇️
server/tso/tso.go	77.37% <0%> (-3.65%)	⬇️
server/schedulers/shuffle_hot_region.go	61.29% <0%> (-3.23%)	⬇️
server/member/leader.go	76.53% <0%> (-2.05%)	⬇️
client/client.go	69.18% <0%> (-0.84%)	⬇️
server/coordinator.go	84.3% <0%> (-0.69%)	⬇️
... and 6 more

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[nolouch]

PTAL @shafreeck

[overvenus]

[sre-bot]

/run-all-tests