CHANGELOG-3.6: Set v3.6.0-rc.0 release date

Signed-off-by: Ivan Valdes <[email protected]>

Author: ivanvc

CHANGELOG/CHANGELOG-3.6.md

@@ -6,6 +6,10 @@ Previous change logs can be found at [CHANGELOG-3.5](https://github.com/etcd-io/
 
 ## v3.6.0 (TBD)
 
+<hr>
+
+## v3.6.0-rc.0 (2025-02-13)
+
 See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v3.6.0).
 
 ### Breaking Changes