Update src/oas.md

Author: ralfhandl

src/oas.md

@@ -4017,7 +4017,7 @@ oneOf:
 ### Modeling Non-JSON Data
 
 This section describes how to model non-JSON formats, either by mapping the format into the
-[JSON Schema data model](https://www.ietf.org/archive/id/draft-bhutton-json-schema-01.html#name-instance-data-model)
+[JSON Schema data model](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-01.html#name-instance-data-model)
 or by using additional Objects such as the [Encoding Object](#encoding-object).
 
 #### XML Modeling