Replace deprecated toMap usages with toMapBy

libraries/stdlib/src/kotlin/text/CharCategoryJVM.kt

@@ -161,7 +161,7 @@ public enum class CharCategory(public val value: Int, public val code: String) {
 
 
     public companion object {
-        private val categoryMap by lazy { CharCategory.values().toMap { it.value } }
+        private val categoryMap by lazy { CharCategory.values().toMapBy { it.value } }
 
         public fun valueOf(category: Int): CharCategory = categoryMap[category] ?: throw IllegalArgumentException("Category #$category is not defined.")
     }

libraries/stdlib/src/kotlin/text/CharDirectionalityJVM.kt

@@ -110,7 +110,7 @@ public enum class CharDirectionality(public val value: Int) {
 
 
     public companion object {
-        private val directionalityMap by lazy { CharDirectionality.values().toMap { it.value } }
+        private val directionalityMap by lazy { CharDirectionality.values().toMapBy { it.value } }
 
         public fun valueOf(directionality: Int): CharDirectionality = directionalityMap[directionality] ?: throw IllegalArgumentException("Directionality #$directionality is not defined.")
     }