chore: regenerate openapi spec and client for version bump

Author: github-actions[bot]

public/openapi.yaml

@@ -2,7 +2,7 @@
 openapi: 3.0.3
 info:
   title: html2rss-web API
-  version: 1.1.0
+  version: 1.2.0
   description: RESTful API for converting websites to RSS feeds.
   contact:
     name: html2rss-web Support