Remove redundant `squish` for single line message

activemodel/lib/active_model/attribute_set/builder.rb

@@ -78,7 +78,7 @@ def marshal_dump
 
     def marshal_load(values)
       if values.is_a?(Hash)
-        ActiveSupport::Deprecation.warn(<<~MSG.squish)
+        ActiveSupport::Deprecation.warn(<<~MSG)
           Marshalling load from legacy attributes format is deprecated and will be removed in Rails 6.2.
         MSG
         empty_hash = {}.freeze

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -21,7 +21,7 @@ def type_cast(value, column = nil)
         value = id_value_for_database(value) if value.is_a?(Base)
 
         if column
-          ActiveSupport::Deprecation.warn(<<~MSG.squish)
+          ActiveSupport::Deprecation.warn(<<~MSG)
             Passing a column to `type_cast` is deprecated and will be removed in Rails 6.2.
           MSG
           type = lookup_cast_type_from_column(column)