Configure.ac: Bump version to 3.89.1

* Development focus is moved to Gtk+ 4.x now.
* Later I will move Gtk+ 3.18.x theming to 'legacy' option.
  - I believe most Adapta users aleady live with Gtk+ 3.2x series.
* Until bumped to 4.0, I will switch to SassC processing.
  - I already added it to TODOs.

Signed-off-by: tista500 <tista.gma500@gmail.com>

Author: tista500

configure.ac

@@ -1,6 +1,6 @@
 AC_INIT(
 	[Adapta ],
-	3.22.4,
+	3.89.1,
 	[https://github.com/adapta-project/adapta-gtk-theme],
 	[adapta-gtk-theme]
 )