bump openapi version to 1.8.0

Author: sevenzing

docs/docs.ensnode.io/ensapi-openapi.json

@@ -2,7 +2,7 @@
   "openapi": "3.1.0",
   "info": {
     "title": "ENSApi APIs",
-    "version": "1.7.0",
+    "version": "1.8.0",
     "description": "APIs for ENS resolution, navigating the ENS nameforest, and metadata about an ENSNode"
   },
   "servers": [