Cleanup deprecated methods.

Noticed a handful of deprecated methods and minor warnings while looking around.
Replaces with recommended methods

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/util/Util.kt

@@ -29,10 +29,10 @@ fun UByteArray.toHexString() : String {
 
 fun Array<UByte>.hexColumnsPrint(chunk: Int = 16) {
     val printout = this.map { it.toString(16).padStart(2, '0') }.chunked(chunk)
-    printout.forEach { println(it.joinToString(separator = " ") { it.toUpperCase() }) }
+    printout.forEach { println(it.joinToString(separator = " ") { it.uppercase() }) }
 }
 
 fun UByteArray.hexColumnsPrint(chunk: Int = 16) {
     val printout = this.map { it.toString(16).padStart(2, '0') }.chunked(chunk)
-    printout.forEach { println(it.joinToString(separator = " ") { it.toUpperCase() }) }
+    printout.forEach { println(it.joinToString(separator = " ") { it.uppercase() }) }
 }