CHANGELOG: add note regarding updating to go 1.22.7

[ivanvc]

Update 3.4 and 3.5 CHANGELOG to add a note regarding the Go update to 1.22.7.

Part of #18548.

To be merged after #18549, #18550.

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 (4a11ca6) to head (aecb137).

❗ Current head aecb137 differs from pull request most recent head e3bade8

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Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18553      +/-   ##
==========================================
+ Coverage   68.73%   68.90%   +0.16%     
==========================================
  Files         420      420              
  Lines       35470    35470              
==========================================
+ Hits        24381    24439      +58     
+ Misses       9668     9616      -52     
+ Partials     1421     1415       -6     

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[ivanvc]

/retest

[jmhbnz]

LGTM - Thanks @ivanvc

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