CHANGELOG: Add release date of etcd v3.4.35

[ArkaSaha30]

Set the v3.4.35 release date to today.

Part of #18845.

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

[ivanvc]

LGTM. Thanks, @ArkaSaha30

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 23.07692% with 20 lines in your changes missing coverage. Please review.

Project coverage is 68.71%. Comparing base (bd88963) to head (599f6f1).
Report is 36 commits behind head on main.

❗ Current head 599f6f1 differs from pull request most recent head 91e8ff6

Please upload reports for the commit 91e8ff6 to get more accurate results.

Files with missing lines	Patch %	Lines
server/storage/backend/backend.go	18.18%	9 Missing ⚠️
etcdctl/ctlv3/command/printer.go	0.00%	3 Missing ⚠️
etcdctl/ctlv3/command/check.go	0.00%	2 Missing ⚠️
server/embed/serve.go	0.00%	1 Missing and 1 partial ⚠️
etcdutl/etcdutl/snapshot_command.go	0.00%	1 Missing ⚠️
server/etcdserver/api/rafthttp/http.go	66.66%	0 Missing and 1 partial ⚠️
server/etcdserver/apply_v2.go	0.00%	0 Missing and 1 partial ⚠️
server/lease/leasehttp/http.go	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
etcdctl/ctlv3/command/elect_command.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/ep_command.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/lease_command.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/printer_fields.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/printer_simple.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/printer_table.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/snapshot_command.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/user_command.go	0.00% <ø> (ø)
etcdctl/ctlv3/ctl.go	0.00% <ø> (ø)
etcdutl/ctl.go	0.00% <ø> (ø)
... and 13 more

... and 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18884      +/-   ##
==========================================
- Coverage   68.78%   68.71%   -0.07%     
==========================================
  Files         420      420              
  Lines       35523    35532       +9     
==========================================
- Hits        24433    24415      -18     
- Misses       9665     9691      +26     
- Partials     1425     1426       +1     

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[jmhbnz]

/retitle CHANGELOG: Add release date of etcd v3.4.35
/retest

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArkaSaha30, ivanvc, jmhbnz

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