Exclude tomcat-embed-core

[stuartwdouglas]

It contains an old copy of the Servlet API and causes problems.

Fixes #20910

[quarkus-bot]

Failing Jobs - Building fafd37b

Status	Name	Step	Failures	Logs	Raw logs
✖	Native Tests - Messaging2	Build	Failures	Logs	Raw logs

Full information is available in the Build summary check run.

Failures

⚙️ Native Tests - Messaging2 #

- Failing: integration-tests/reactive-messaging-rabbitmq 

📦 integration-tests/reactive-messaging-rabbitmq

✖ io.quarkus.it.rabbitmq.RabbitMQConnectorIT.test - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Assertion condition defined as a io.quarkus.it.rabbitmq.RabbitMQConnectorTest expected: <6> but was: <0> within 30 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:164)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:119)