[ruby/irb] Bump version to v1.11.0

(https://github.com/ruby/irb/pull/818)

https://github.com/ruby/irb/commit/7421359b92

lib/irb/version.rb

@@ -5,7 +5,7 @@
 #
 
 module IRB # :nodoc:
-  VERSION = "1.10.1"
+  VERSION = "1.11.0"
   @RELEASE_VERSION = VERSION
-  @LAST_UPDATE_DATE = "2023-12-05"
+  @LAST_UPDATE_DATE = "2023-12-19"
 end