Revert "Switch settings to safe yaml load (#19928)" (#19982)

app/models/settings/base.rb

@@ -153,17 +153,7 @@ module Settings
 
     # get the setting's value, YAML decoded
     def value
-      return if self[:value].blank?
-
-      YAML.safe_load(self[:value],
-                     permitted_classes: [
-                       ActiveSupport::HashWithIndifferentAccess,
-                       ActiveSupport::TimeZone,
-                       ActiveSupport::TimeWithZone,
-                       BigDecimal,
-                       Symbol,
-                       Time,
-                     ])
+      YAML.unsafe_load(self[:value]) if self[:value].present?
     end
 
     # set the settings's value, YAML encoded