Merge pull request #20690 from ivanvc/release-3.5.23-and-3.6.5-dates

CHANGELOG: Set release 3.5.23 and 3.6.5 dates

Author: ahrtr

CHANGELOG/CHANGELOG-3.5.md

@@ -4,7 +4,11 @@ Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/
 
 ---
 
-## v3.5.23 (TBA)
+## v3.5.24 (TBA)
+
+---
+
+## v3.5.23 (2025-09-19)
 
 ### etcd server
 

CHANGELOG/CHANGELOG-3.6.md

@@ -4,7 +4,11 @@ Previous change logs can be found at [CHANGELOG-3.5](https://github.com/etcd-io/
 
 ---
 
-## v3.6.5 (TBA)
+## v3.6.6 (TBA)
+
+---
+
+## v3.6.5 (2025-09-19)
 
 ### etcd server