Fix error message for SUPERTYPE_IS_SUSPEND_FUNCTION_TYPE

#KT-48907 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt

@@ -68,7 +68,7 @@ class SimpleKotlinGradleIT : KGPBaseTest() {
     fun testLanguageVersion(gradleVersion: GradleVersion) {
         project("languageVersion", gradleVersion) {
             buildAndFail("build") {
-                assertOutputContains("Suspend function type is not allowed as supertypes")
+                assertOutputContains("Suspend function type is allowed as a supertype only since version 1.6")
             }
         }
     }

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

@@ -1,4 +1,4 @@
 source(new File(basedir, "../../../verify-common.bsh").getAbsolutePath());
 
 assertBuildLogHasLine("[INFO] BUILD FAILURE");
-assertBuildLogHasLineThatContains("Suspend function type is not allowed as supertypes");
+assertBuildLogHasLineThatContains("Suspend function type is allowed as a supertype only since version 1.6");