docs: correct openapi version to 0.2.2

Author: sangalo20

nexus-broker/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.0.3
 info:
   title: Nexus Broker API
-  version: 0.3.0
+  version: 0.2.2
   description: |
     Internal API for the Nexus Broker service. 
     This service handles OAuth 2.0 and OIDC flows, encrypts tokens, and manages provider configurations.