Add `test` scope to `jetty-quic-util` JUnit dependency

[Petersoj]

The pom.xml for jetty-quic-util doesn't include <scope>test</scope> for the JUnit dependency, causing JUnit to appear on the runtime classpath:

jetty.project/jetty-core/jetty-quic/jetty-quic-util/pom.xml

Lines 18 to 21 in a016cf8

	<dependency>
	<groupId>org.junit.jupiter</groupId>
	<artifactId>junit-jupiter</artifactId>
	</dependency>

[olamy]

Thanks for the report.