test: use implicit schema conversion for MQTT5 sessionExpiryInterval

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: bielu

test/ByteBard.AsyncAPI.Tests/Bindings/MQTT5/MQTT5Bindings_Should.cs

@@ -36,13 +36,13 @@ public void ServerBinding_SerializesSchemaAndReference(AsyncApiVersion version)
         {
             var schemaBinding = new MQTT5ServerBinding
             {
-                SessionExpiryInterval = new MQTTIntegerSchema(new AsyncApiJsonSchema { Type = SchemaType.Integer }),
+                SessionExpiryInterval = new AsyncApiJsonSchema { Type = SchemaType.Integer },
             };
             schemaBinding.SerializeAsYaml(version).Should().Contain("type: integer");
 
             var referenceBinding = new MQTT5ServerBinding
             {
-                SessionExpiryInterval = new MQTTIntegerSchema(new AsyncApiJsonSchemaReference("#/components/schemas/interval")),
+                SessionExpiryInterval = new AsyncApiJsonSchemaReference("#/components/schemas/interval"),
             };
             referenceBinding.SerializeAsYaml(version).Should().Contain("#/components/schemas/interval");
         }