Update CHANGELOG.md (#72119)

* Add Swift 5.10 release date.
* Cherry-pick #72110.

---------

Co-authored-by: Manoj Mahapatra <[email protected]>

Author: benrimmington

CHANGELOG.md

@@ -198,7 +198,9 @@
 
 ## Swift 5.10
 
-* Swift 5.10 closes all known static data-race safey holes in complete strict
+### 2024-03-05 (Xcode 15.3)
+
+* Swift 5.10 closes all known static data-race safety holes in complete strict
 concurrency checking.
 
   When writing code against `-strict-concurrency=complete`, Swift 5.10 will