added email validation to the user's email address (alexjustesen#445)

Author: alexjustesen

app/Filament/Resources/UserResource.php

@@ -41,6 +41,7 @@ public static function form(Form $form): Form
                         ->required(),
                     'email' => TextInput::make('email')
                         ->required()
+                        ->email()
                         ->unique(ignoreRecord: true),
                     'password' => TextInput::make('password')
                         ->required()