Fix contract test.

Author: zzhlogin

appsignals-tests/contract-tests/src/test/java/software/amazon/opentelemetry/appsignals/test/base/JMXMetricsContractTestBase.java

@@ -85,6 +85,7 @@ protected long getThreshold(String metricName) {
         // https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/MemoryUsage.html#getMax()
       case JMXMetricsConstants.TOMCAT_THREADS:
         threshold = -3;
+        break;
       case JMXMetricsConstants.JVM_HEAP_MAX:
       case JMXMetricsConstants.JVM_NON_HEAP_MAX:
       case JMXMetricsConstants.JVM_POOL_MAX: