swagger-codegen: update homepage

```
$ curl -I https://swagger.io/swagger-codegen/
HTTP/2 301
date: Tue, 02 Jan 2024 16:07:29 GMT
content-type: text/html; charset=utf-8
cache-control: no-cache
pragma: no-cache
expires: -1
location: /tools/swagger-codegen/
x-frame-options: SAMEORIGIN
set-cookie: CMSPreferredCulture=en-US; expires=Thu, 02-Jan-2025 16:07:29 GMT; path=/; secure; HttpOnly
x-powered-by: ASP.NET
x-xss-protection: 1; mode=block
strict-transport-security: max-age=31536000; includeSubDomains; preload
cf-cache-status: DYNAMIC
server: cloudflare
cf-ray: 83f4415b1816185d-EWR
alt-svc: h3=":443"; ma=86400
```

Signed-off-by: Rui Chen <[email protected]>

Formula/s/swagger-codegen.rb

@@ -1,6 +1,6 @@
 class SwaggerCodegen < Formula
   desc "Generate clients, server stubs, and docs from an OpenAPI spec"
-  homepage "https://swagger.io/swagger-codegen/"
+  homepage "https://swagger.io/tools/swagger-codegen/"
   url "https://github.com/swagger-api/swagger-codegen/archive/refs/tags/v3.0.51.tar.gz"
   sha256 "6c41229d8a864dc71f4941670ecf26e95c7f8fb5dc2f9d03a29ff3a1ae10852a"
   license "Apache-2.0"