LV20: Fix maven plugins test metadata

libraries/tools/kotlin-maven-plugin-test/src/it/test-apiVersion/verify.bsh

@@ -1,4 +1,4 @@
 source(new File(basedir, "../../../verify-common.bsh").getAbsolutePath());
 
 assertBuildLogHasLine("[INFO] BUILD FAILURE");
-assertBuildLogHasLineThatContains("Unresolved reference: uppercase");
+assertBuildLogHasLineThatContains("This declaration needs opt-in.");

libraries/tools/kotlin-maven-plugin-test/src/it/test-helloworld-kts/pom.xml

@@ -61,6 +61,7 @@
                         <configuration>
                             <args>
                                 <arg>-Xallow-any-scripts-in-source-roots</arg>
+                                <arg>-Xuse-fir-lt=false</arg>
                             </args>
                         </configuration>
                     </execution>