chore: versioned clients CHANGELOG entry

[dbolduc]

Related to #10170

This seemed worthy of a CHANGELOG entry

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This change is 

[codecov]

Codecov Report

Base: 93.64% // Head: 93.64% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5987355) compared to base (60a284e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10958   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files        1717     1717           
  Lines      154918   154918           
=======================================
+ Hits       145070   145072    +2     
+ Misses       9848     9846    -2     

Impacted Files	Coverage Δ
...le/cloud/storage/internal/curl_download_request.cc	88.62% <0.00%> (-0.34%)	⬇️
google/cloud/pubsub/samples/samples.cc	86.94% <0.00%> (-0.22%)	⬇️
google/cloud/storage/parallel_upload.cc	98.62% <0.00%> (+0.34%)	⬆️
...cloud/pubsub/internal/subscription_session_test.cc	98.49% <0.00%> (+0.66%)	⬆️
...e/cloud/pubsublite/internal/alarm_registry_impl.cc	100.00% <0.00%> (+2.94%)	⬆️

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