Add release date to the Changelog for the 2.15.6 release.

mbyrnepr2 · mbyrnepr2 · commit 1b3355c93c07 · 2023-07-13T15:03:54.000+02:00
diff --git a/ChangeLog b/ChangeLog
@@ -207,7 +207,7 @@ Release date: TBA
 
 What's New in astroid 2.15.6?
 =============================
-Release date: TBA
+Release date: 2023-07-08
 
 * Harden ``get_module_part()`` against ``"."``.
 
