[ML] fixing ML test failures due to the 8.1.0 version bump (#79944) (#79951)

Fixing test failures due to version 8.1.0 version bump. closes:
#79939 closes:
#79932

Co-authored-by: Elastic Machine <[email protected]>

Author: benwtrent

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/datafeed/AggProviderWireSerializationTests.java

@@ -68,7 +68,7 @@ public static AggProvider createRandomValidAggProvider() {
 
     @Override
     protected AggProvider mutateInstanceForVersion(AggProvider instance, Version version) {
-        if (version.onOrBefore(Version.V_8_0_0)) {
+        if (version.before(Version.V_8_0_0)) {
             return new AggProvider(instance.getAggs(), instance.getParsedAggs(), instance.getParsingException(), false);
         }
         return instance;

x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/action/TransportStartDataFrameAnalyticsActionTests.java

@@ -129,11 +129,15 @@ public void testGetAssignment_MlNodesAreTooOld() {
                 ),
                 containsString(
                     "Not opening job [data_frame_id] on node [{_node_name1}{version=7.9.1}], "
-                        + "because the data frame analytics created for version [8.0.0] requires a node of version [7.10.0] or higher"
+                        + "because the data frame analytics created for version ["
+                        + Version.CURRENT
+                        + "] requires a node of version [7.10.0] or higher"
                 ),
                 containsString(
                     "Not opening job [data_frame_id] on node [{_node_name2}{version=7.9.2}], "
-                        + "because the data frame analytics created for version [8.0.0] requires a node of version [7.10.0] or higher"
+                        + "because the data frame analytics created for version ["
+                        + Version.CURRENT
+                        + "] requires a node of version [7.10.0] or higher"
                 )
             )
         );