chore(openapi): bump api version (#5574)

Author: acud

openapi/Swarm.yaml

@@ -1,7 +1,7 @@
 openapi: 3.0.3
 
 info:
-  version: 8.1.0
+  version: 8.1.1
   title: Bee API
   description: "API endpoints for interacting with the Swarm network, supporting file operations, messaging, and node management"