CLI: fix "unknown JVM target version" error message

Do not list 1.6 as supported because it was removed in KT-45165.

 #KT-66175 Fixed

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/jvmArguments.kt

@@ -79,7 +79,7 @@ fun CompilerConfiguration.setupJvmSpecificArguments(arguments: K2JVMCompilerArgu
         } else {
             messageCollector.report(
                 ERROR, "Unknown JVM target version: $jvmTargetValue\n" +
-                        "Supported versions: ${JvmTarget.entries.joinToString { it.description }}"
+                        "Supported versions: ${JvmTarget.supportedValues().joinToString { it.description }}"
             )
         }
     }

compiler/testData/cli/jvm/wrongJvmTargetVersion.out

@@ -1,3 +1,3 @@
 error: unknown JVM target version: 1.5
-Supported versions: 1.6, 1.8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
+Supported versions: 1.8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
 COMPILATION_ERROR