OAD schema 'parameter object' + in: querystring drop not+required subschema

This subschema would only forbid the presence of all four properties, rather than any of them, but it is superfluous as these properties are caught by `unevaluatedProperties: false`.

Author: notEthan

src/schemas/validation/schema.yaml

@@ -392,12 +392,6 @@ $defs:
         then:
           required:
             - content
-          not:
-            required:
-              - schema
-              - style
-              - explode
-              - allowReserved
     dependentSchemas:
       schema:
         properties: