[K/N] Deprecate Char.MIN_RADIX and MAX_RADIX constants

As a part of efforts to stabilize Native stdlib.

kotlin-native/runtime/src/main/kotlin/kotlin/Char.kt

@@ -181,11 +181,15 @@ public class Char private constructor() : Comparable<Char> {
         /**
          * The minimum radix available for conversion to and from strings.
          */
+        @Deprecated("Introduce your own constant with the value of `2`", ReplaceWith("2"))
+        @DeprecatedSinceKotlin(warningSince = "1.9")
         public const val MIN_RADIX: Int = 2
 
         /**
          * The maximum radix available for conversion to and from strings.
          */
+        @Deprecated("Introduce your own constant with the value of `36", ReplaceWith("36"))
+        @DeprecatedSinceKotlin(warningSince = "1.9")
         public const val MAX_RADIX: Int = 36
     }