Update packages, use explicit type, use Microsoft OpenApi package

src/WebApi/Cars/DeleteCar.cs

@@ -16,7 +16,7 @@ public static class DeleteCar
 		ApplicationDbContext dbContext,
 		CancellationToken cancellationToken)
 	{
-		var car = await dbContext.Cars.FindAsync([new CarId(id)], cancellationToken: cancellationToken);
+		Car? car = await dbContext.Cars.FindAsync([new CarId(id)], cancellationToken: cancellationToken);
 
 		if (car is null)
 		{