Bump turbo-rails for Turbo.offline.clearCache()

Simplify the clear-offline-cache controller to use the new
Turbo.offline.clearCache() API instead of messaging the service
worker directly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Gemfile.lock

@@ -13,7 +13,7 @@ GIT
 
 GIT
   remote: https://github.com/hotwired/turbo-rails.git
-  revision: ca62e8bdad88d01914d512ad24424e0670f239c9
+  revision: 4104a353cfe728232dc0eed6d54c77466a9849f2
   branch: offline-cache
   specs:
     turbo-rails (2.0.23)

Gemfile.saas.lock

@@ -62,7 +62,7 @@ GIT
 
 GIT
   remote: https://github.com/hotwired/turbo-rails.git
-  revision: ca62e8bdad88d01914d512ad24424e0670f239c9
+  revision: 4104a353cfe728232dc0eed6d54c77466a9849f2
   branch: offline-cache
   specs:
     turbo-rails (2.0.23)

app/javascript/controllers/clear_offline_cache_controller.js

@@ -1,8 +1,8 @@
 import { Controller } from "@hotwired/stimulus"
+import { Turbo } from "@hotwired/turbo-rails"
 
 export default class extends Controller {
-  async clearCache() {
-    const registration = await navigator.serviceWorker?.ready
-    registration?.active?.postMessage({ action: "clearCache" })
+  clearCache() {
+    Turbo.offline.clearCache()
   }
 }