CHANGELOG: set release 3.4.34 date

[ivanvc]

Set the v3.4.34 release date to today.

Part of #18486.

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

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.90%. Comparing base (fdbde77) to head (e0f370b).

❗ Current head e0f370b differs from pull request most recent head 94e5502

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Additional details and impacted files

see 17 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18577      +/-   ##
==========================================
+ Coverage   68.77%   68.90%   +0.12%     
==========================================
  Files         420      420              
  Lines       35474    35474              
==========================================
+ Hits        24396    24442      +46     
+ Misses       9656     9610      -46     
  Partials     1422     1422              

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[jmhbnz]

LGTM - Thanks @ivanvc

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