PHPStan and StyleCI fixes

- Updated PhpStan PHP version option to match project.
- Applied StyleCI changes.
- Updated static to self in WebhookFormatter, following static analysis
  guidance.
- Fixed mis-matched header tags.

app/Actions/WebhookFormatter.php

@@ -116,7 +116,7 @@ class WebhookFormatter
 
     public static function getDefault(string $event, Webhook $webhook, $detail, User $initiator, int $initiatedTime): self
     {
-        $instance = new static($event, $webhook, $detail, $initiator, $initiatedTime);
+        $instance = new self($event, $webhook, $detail, $initiator, $initiatedTime);
         $instance->addDefaultModelFormatters();
 
         return $instance;

phpstan.neon.dist

@@ -9,7 +9,7 @@ parameters:
     # The level 8 is the highest level
     level: 1
 
-    phpVersion: 70300
+    phpVersion: 70400
 
     bootstrapFiles:
       - bootstrap/phpstan.php

resources/views/settings/customization.blade.php

@@ -1,7 +1,7 @@
 @extends('settings.layout')
 
 @section('card')
-    <h1 id="customization" class="list-heading">{{ trans('settings.app_customization') }}</h2>
+    <h1 id="customization" class="list-heading">{{ trans('settings.app_customization') }}</h1>
     <form action="{{ url("/settings/customization") }}" method="POST" enctype="multipart/form-data">
         {!! csrf_field() !!}
         <input type="hidden" name="section" value="customization">

resources/views/settings/registration.blade.php

@@ -1,7 +1,7 @@
 @extends('settings.layout')
 
 @section('card')
-    <h1 id="registration" class="list-heading">{{ trans('settings.reg_settings') }}</h2>
+    <h1 id="registration" class="list-heading">{{ trans('settings.reg_settings') }}</h1>
     <form action="{{ url("/settings/registration") }}" method="POST">
         {!! csrf_field() !!}
         <input type="hidden" name="section" value="registration">