Mark scrub as an unsafe method on SafeBuffer

activesupport/lib/active_support/core_ext/string/output_safety.rb

@@ -134,7 +134,7 @@ module ActiveSupport #:nodoc:
   class SafeBuffer < String
     UNSAFE_STRING_METHODS = %w(
       capitalize chomp chop delete delete_prefix delete_suffix
-      downcase lstrip next reverse rstrip slice squeeze strip
+      downcase lstrip next reverse rstrip scrub slice squeeze strip
       succ swapcase tr tr_s unicode_normalize upcase
     )
 

activesupport/test/safe_buffer_test.rb

@@ -88,6 +88,7 @@ class SafeBufferTest < ActiveSupport::TestCase
     next: nil,
     reverse: nil,
     rstrip: nil,
+    scrub: nil,
     slice: "foo",
     squeeze: nil,
     strip: nil,