chore: Update interface version for Classic era 1.15.6

Author: syndenbock

MinimapButtonButton/MinimapButtonButton.toc

@@ -2,7 +2,7 @@
 ## Interface-Cata: 40401
 ## Interface-Wrath: 30403
 ## Interface-BCC: 20504
-## Interface-Classic: 11505
+## Interface-Classic: 11506
 ## Title: MinimapButtonButton
 ## Title-ruRU: Универсальная кнопка миникарты
 ## Version: 1.20.6