Merge branch '#49-laravel-9' into #41-email-notifications

# Conflicts:
#	app/Architecture/Providers/EventServiceProvider.php
#	app/Domain/VacationRequestStateManager.php
#	resources/lang/pl.json

tests/Feature/HolidayTest.php

@@ -122,6 +122,6 @@ class HolidayTest extends FeatureTestCase
             ->delete("/holidays/{$holiday->id}")
             ->assertSessionHasNoErrors();
 
-        $this->assertDeleted($holiday);
+        $this->assertModelMissing($holiday);
     }
 }