[ML] Fix failing JobUpdateTests.testMergeWithJob test (#99571)

Ensure that a random compatible _MlConfigVersion_ is used to set the job
version.

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/job/config/JobUpdateTests.java

@@ -7,14 +7,12 @@
 package org.elasticsearch.xpack.core.ml.job.config;
 
 import org.elasticsearch.ElasticsearchStatusException;
-import org.elasticsearch.Version;
 import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.common.unit.ByteSizeUnit;
 import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.test.AbstractXContentSerializingTestCase;
-import org.elasticsearch.test.VersionUtils;
 import org.elasticsearch.xcontent.XContentParser;
 import org.elasticsearch.xpack.core.ml.MlConfigVersion;
 import org.elasticsearch.xpack.core.ml.job.process.autodetect.state.ModelSnapshot;
@@ -294,7 +292,7 @@ public class JobUpdateTests extends AbstractXContentSerializingTestCase<JobUpdat
         updateBuilder.setPerPartitionCategorizationConfig(new PerPartitionCategorizationConfig(true, randomBoolean()));
         updateBuilder.setCustomSettings(customSettings);
         updateBuilder.setModelSnapshotId(randomAlphaOfLength(10));
-        updateBuilder.setJobVersion(MlConfigVersion.fromVersion(VersionUtils.randomCompatibleVersion(random(), Version.CURRENT)));
+        updateBuilder.setJobVersion(MlConfigVersionUtils.randomCompatibleVersion(random()));
         updateBuilder.setModelPruneWindow(TimeValue.timeValueDays(randomIntBetween(1, 100)));
         JobUpdate update = updateBuilder.build();