Adjust testData to *Map transformation

compiler/testData/codegen/box/builtinsProperties/maps.kt

@@ -5,27 +5,27 @@ class A : Map<String, String> {
         throw UnsupportedOperationException()
     }
 
-    override fun containsKey(key: Any?): Boolean {
+    override fun containsKey(key: String): Boolean {
         throw UnsupportedOperationException()
     }
 
-    override fun containsValue(value: Any?): Boolean {
+    override fun containsValue(value: String): Boolean {
         throw UnsupportedOperationException()
     }
 
-    override fun get(key: Any?): String? {
+    override fun get(key: String): String? {
         throw UnsupportedOperationException()
     }
 
-    override fun keySet(): Set<String> {
+    override val keys: Set<String> get() {
         throw UnsupportedOperationException()
     }
 
-    override fun values(): Collection<String> {
+    override val values: Collection<String> get() {
         throw UnsupportedOperationException()
     }
 
-    override fun entrySet(): Set<Map.Entry<String, String>> {
+    override val entries: Set<Map.Entry<String, String>> get() {
         throw UnsupportedOperationException()
     }
 }