Add 12.0 changelog (#1143)

Close #1141

Author: tagliala

CHANGELOG.md

@@ -16,6 +16,13 @@ As such, _Breaking Changes_ are major. _Features_ would map to either major or m
   * [@tagliala Add back Ruby 3.1 compatibility](https://github.com/mbleigh/acts-as-taggable-on/pull/1082)
   * Reduce packaged gem size
 
+### [v12.0.0) / 2024-11-09](https://github.com/mbleigh/acts-as-taggable-on/compare/v11.0.0...v12.0.0)
+
+* Breaking Changes
+  * Drop support for Ruby < 3.2
+* Features
+  * Add support for Rails 8.0
+
 ### [v11.0.0) / 2024-08-23](https://github.com/mbleigh/acts-as-taggable-on/compare/v10.0.0...v11.0.0)
 - Removed support for Ruby 2.7
 - Removed support for Rails 6.1