doc(sdk): Fix CHANGELOG.md entry

[Hywan]

The link for an entry was wrong. It's #5439, not #5442.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.57%. Comparing base (1eb8f6a) to head (ecc3e4a).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5524   +/-   ##
=======================================
  Coverage   88.56%   88.57%           
=======================================
  Files         340      340           
  Lines       93694    93694           
  Branches    93694    93694           
=======================================
+ Hits        82982    82989    +7     
+ Misses       6579     6572    -7     
  Partials     4133     4133           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[codspeed-hq]

CodSpeed Performance Report

Merging #5524 will improve performances by 35.16%

_{Comparing Hywan:doc-sdk-changelog-fix-5439 (ecc3e4a) with main (1eb8f6a)}

Summary

⚡ 1 improvements
✅ 30 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	Restore session [memory store]	244.1 ms	180.6 ms	+35.16%