Fix typo

Co-authored-by: Jeremy Fiel <32110157+jeremyfiel@users.noreply.github.com>

Author: handrews

src/schemas/validation/schema.yaml

@@ -542,7 +542,7 @@ $defs:
     allOf:
       - $ref: '#/$defs/examples'
       - $ref: '#/$defs/specification-extensions'
-      - dependentSchema:
+      - dependentSchemas:
           encoding:
             properties:
               prefixEncoding: false