Update plugin version text (#1454)

Author: Jowan-Spooner

addons/dialogic/plugin.cfg

@@ -4,5 +4,5 @@ name="Dialogic"
 description="Create dialogs, characters and scenes to display conversations in your Godot games.
 https://github.com/coppolaemilio/dialogic"
 author="Emi, Jowan Spooner, thebardsrc, and more!"
-version="2.0-Alpha-6 (for Godot 4 RC1)"
+version="2.0-Alpha-6 (for Godot 4.0 stable)"
 script="plugin.gd"