chore: fix phpstan errors

src/BusProNet/Model/Service.php

@@ -55,6 +55,7 @@ class Service
     #[Groups(['booking'])]
     public ?int $totalCount = null;
 
+    /** @var list<int> */
     #[Groups(['api:single', 'snapshot'])]
     public array $mapping = [];
 
@@ -64,6 +65,7 @@ class Service
     #[Groups(['api:single', 'snapshot'])]
     public ?float $totalPrice = null;
 
+    /** @var array<int, float|null> */
     #[Groups(['api:single', 'snapshot'])]
     public array $individualPrice = [];
 
@@ -91,6 +93,7 @@ class Service
     #[Groups(['api:single', 'api:list', 'snapshot'])]
     public ?string $ageConstraintType = null;
 
+    /** @var array<string, mixed>|null */
     #[Groups(['api:single'])]
     public ?array $ageConstraintMetadata = null;