chore: bump version to v1.13.0 (#1144)

Automated version bump to `v1.13.0`.

This PR contains the version update in `config/version.rb` and
regenerated OpenAPI specs and frontend API client.

### 🚀 Next Steps
1. Verify that all CI checks pass.
2. Merge this Pull Request.
3. Go to the draft release on GitHub and publish it.

Co-authored-by: gildesmarais <350021+gildesmarais@users.noreply.github.com>

Author: gildesmarais

config/version.rb

@@ -2,7 +2,7 @@
 
 module Html2rss
   module Web
-    VERSION = '1.12.2'
+    VERSION = '1.13.0'
     public_constant :VERSION
   end
 end

public/openapi.yaml

@@ -2,7 +2,7 @@
 openapi: 3.0.3
 info:
   title: html2rss-web API
-  version: 1.12.2
+  version: 1.13.0
   description: RESTful API for converting websites to RSS feeds.
   contact:
     name: html2rss-web Support