5.21.2

@rjsf/core

• Updated SchemaField to pass required flag to _AnyOfField/_OneOfField
• Updated Form to deal with null objects in filterErrorsBasedOnSchema(), fixing #4306

@rjsf/utils

• Updated ErrorSchemaBuilder to support adding, updating, and removing paths that are numbers, fixing #4297
• Updated retrieveSchema to not merge contains properties in allOf schema lists, fixing #2923

Dev / docs / playground

• Updated the custom-widgets-fields.md to add examples of wrapping a widget/field