[kotlin] Update test data KT-63528

GitOrigin-RevId: 8e9ea174c26670fbe9666dc960528d5fb9ca8842

plugins/kotlin/idea/tests/testData/externalAnnotations/notNullMethod.fir.kt

@@ -1,6 +1,6 @@
 fun test() {
     val x = ClassWithExternalAnnotatedMembers()
-    x.notNullMethod()?.foo()
+    x.notNullMethod()<warning descr="[UNNECESSARY_SAFE_CALL] Unnecessary safe call on a non-null receiver of type 'kotlin.String'.">?.</warning>foo()
 }
 
 fun String.foo() {