NPA-5664: Version spec bump to V1.13.0

Author: ellie-bound1-NHSD

specification/validated-relationships-service-api.yaml

@@ -3,7 +3,7 @@
 openapi: "3.0.0"
 info:
   title: "Validated Relationships Service API"
-  version: "1.12.0"
+  version: "1.13.0"
   description: |
     ## Overview
     Use this API to access the Validated Relationships Service - the national electronic database of relationships