bump AS deprecation_horizon to 4.1

activesupport/lib/active_support/deprecation.rb

@@ -10,10 +10,10 @@ class << self
       # The version the deprecated behavior will be removed, by default.
       attr_accessor :deprecation_horizon
     end
-    self.deprecation_horizon = '3.2'
+    self.deprecation_horizon = '4.1'
 
     # By default, warnings are not silenced and debugging is off.
     self.silenced = false
     self.debug = false
   end
-end
+end
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