Fix required properties in openapi spec for stricter testing

spec/openapi.yaml

@@ -144,6 +144,15 @@ components:
 
     cve:
       type: object
+      additionalProperties: false
+      required:
+        - id
+        - date_published
+        - project
+        - request_link
+        - cve_pull_request
+        - live_link
+        - status
       properties:
         id:
           type: string
@@ -194,6 +203,10 @@ components:
 
     Error:
       type: object
+      additionalProperties: false
+      required:
+        - status_code
+        - message
       properties:
         status_code:
           type: integer