Add return types to banner functions (#1565)

Author: simon-tma

Diff for: src/JetstreamServiceProvider.php

@@ -53,23 +53,23 @@ public function boot()
         $this->configureRoutes();
         $this->configureCommands();
 
-        RedirectResponse::macro('banner', function ($message) {
+        RedirectResponse::macro('banner', function ($message): RedirectResponse {
             /** @var \Illuminate\Http\RedirectResponse $this */
             return $this->with('flash', [
                 'bannerStyle' => 'success',
                 'banner' => $message,
             ]);
         });
 
-        RedirectResponse::macro('warningBanner', function ($message) {
+        RedirectResponse::macro('warningBanner', function ($message): RedirectResponse {
             /** @var \Illuminate\Http\RedirectResponse $this */
             return $this->with('flash', [
                 'bannerStyle' => 'warning',
                 'banner' => $message,
             ]);
         });
 
-        RedirectResponse::macro('dangerBanner', function ($message) {
+        RedirectResponse::macro('dangerBanner', function ($message): RedirectResponse {
             /** @var \Illuminate\Http\RedirectResponse $this */
             return $this->with('flash', [
                 'bannerStyle' => 'danger',