Bump deprecation message to 8.1

Author: rafaelfranca

activesupport/lib/active_support.rb

@@ -118,12 +118,12 @@ def self.to_time_preserves_timezone
   def self.to_time_preserves_timezone=(value)
     if !value
       ActiveSupport.deprecator.warn(
-        "`to_time` will always preserve the receiver timezone rather than system local time in Rails 8.0. " \
+        "`to_time` will always preserve the receiver timezone rather than system local time in Rails 8.1. " \
         "To opt in to the new behavior, set `config.active_support.to_time_preserves_timezone = :zone`."
       )
     elsif value != :zone
       ActiveSupport.deprecator.warn(
-        "`to_time` will always preserve the full timezone rather than offset of the receiver in Rails 8.0. " \
+        "`to_time` will always preserve the full timezone rather than offset of the receiver in Rails 8.1. " \
         "To opt in to the new behavior, set `config.active_support.to_time_preserves_timezone = :zone`."
       )
     end

activesupport/lib/active_support/core_ext/date_and_time/compatibility.rb

@@ -26,7 +26,7 @@ def self.preserve_timezone # :nodoc:
         # Only warn once, the first time the value is used (which should
         # be the first time #to_time is called).
         ActiveSupport.deprecator.warn(
-          "`to_time` will always preserve the receiver timezone rather than system local time in Rails 8.0." \
+          "`to_time` will always preserve the receiver timezone rather than system local time in Rails 8.1." \
           "To opt in to the new behavior, set `config.active_support.to_time_preserves_timezone = :zone`."
         )