Exclude jackson-dataformat-xml

[JordiMartinezVicent]

As far I see at https://github.com/spring-cloud/spring-cloud-schema-registry/blob/7d99ccbea4cdf02e1431c9345938ff7c89f463ae/spring-cloud-schema-registry-client/pom.xml#L76

<dependency>
			<!-- used for testing https://github.com/spring-cloud/spring-cloud-schema-registry/issues/19 -->
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-xml</artifactId>
			<scope>tests</scope>
		</dependency>

the dependency jackson-dataformat-xml should be excluded but it is not because the scope is tests instead of test. (note the last s)