Slack auth: Switched from community to laravel library

Tested locally before & after change, and looked at code to compare.
Nothing seen or experienced that should affect things, from testing all
is working as expected with no difference from before.
- Update composer requirement of socialite to that which included slack.
- Updated PHP depds while there.
- Updated format of socialite events to align with current documentation
  and to use class references instead of strings.

app/App/Providers/EventServiceProvider.php

@@ -3,7 +3,12 @@
 namespace BookStack\App\Providers;
 
 use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
+use SocialiteProviders\Azure\AzureExtendSocialite;
+use SocialiteProviders\Discord\DiscordExtendSocialite;
+use SocialiteProviders\GitLab\GitLabExtendSocialite;
 use SocialiteProviders\Manager\SocialiteWasCalled;
+use SocialiteProviders\Okta\OktaExtendSocialite;
+use SocialiteProviders\Twitch\TwitchExtendSocialite;
 
 class EventServiceProvider extends ServiceProvider
 {
@@ -14,12 +19,11 @@ class EventServiceProvider extends ServiceProvider
      */
     protected $listen = [
         SocialiteWasCalled::class => [
-            'SocialiteProviders\Slack\SlackExtendSocialite@handle',
+            AzureExtendSocialite::class . '@handle',
-            'SocialiteProviders\Azure\AzureExtendSocialite@handle',
+            OktaExtendSocialite::class . '@handle',
-            'SocialiteProviders\Okta\OktaExtendSocialite@handle',
+            GitLabExtendSocialite::class . '@handle',
-            'SocialiteProviders\GitLab\GitLabExtendSocialite@handle',
+            TwitchExtendSocialite::class . '@handle',
-            'SocialiteProviders\Twitch\TwitchExtendSocialite@handle',
+            DiscordExtendSocialite::class . '@handle',
-            'SocialiteProviders\Discord\DiscordExtendSocialite@handle',
         ],
     ];
 

composer.json

@@ -23,7 +23,7 @@
         "guzzlehttp/guzzle": "^7.4",
         "intervention/image": "^2.7",
         "laravel/framework": "^9.0",
-        "laravel/socialite": "^5.2",
+        "laravel/socialite": "^5.8",
         "laravel/tinker": "^2.6",
         "league/commonmark": "^2.3",
         "league/flysystem-aws-s3-v3": "^3.0",
@@ -37,7 +37,6 @@
         "socialiteproviders/gitlab": "^4.1",
         "socialiteproviders/microsoft-azure": "^5.1",
         "socialiteproviders/okta": "^4.2",
-        "socialiteproviders/slack": "^4.1",
         "socialiteproviders/twitch": "^5.3",
         "ssddanbrown/htmldiff": "^1.0.2"
     },