Update 3.6 changelog to cover the go-grpc-middleware/providers/promet…

[ahrtr]

…heus change

Link to #19195

cc @fuweid @dims @serathius

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

[dims]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.81%. Comparing base (1216d08) to head (49c2249).
Report is 7 commits behind head on main.

Additional details and impacted files

see 20 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #19311   +/-   ##
=======================================
  Coverage   68.80%   68.81%           
=======================================
  Files         420      420           
  Lines       35693    35693           
=======================================
+ Hits        24558    24561    +3     
- Misses       9701     9704    +3     
+ Partials     1434     1428    -6     

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