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() }) }
 }

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/JsSodiumLoader.kt

@@ -27,7 +27,7 @@ object JsSodiumLoader {
 
     }
 
-    suspend fun load() = suspendCoroutine<Unit> { continuation ->
+    suspend fun load() = suspendCoroutine { continuation ->
         if (!getSodiumLoaded()) {
             _libsodiumPromise.then<dynamic> {
                 sodium_init()

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/kdf/Kdf.kt

@@ -27,7 +27,7 @@ actual object Kdf {
     ): UByteArray {
         return getSodium().crypto_kdf_derive_from_key(
             subkeyLength.toUInt(),
-            subkeyId.toUInt(),
+            subkeyId,
             context,
             masterKey.toUInt8Array()
         ).toUByteArray()

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/pwhash/PasswordHash.kt

@@ -8,7 +8,7 @@ import ext.libsodium.com.ionspin.kotlin.crypto.toUInt8Array
 actual object PasswordHash {
     /**
      * The crypto_pwhash() function derives an outlen bytes long key from a password passwd whose length is passwdlen
-     * and a salt salt whose fixed length is crypto_pwhash_SALTBYTES bytes. passwdlen should be at least crypto_pwhash_
+     * and a salt whose fixed length is crypto_pwhash_SALTBYTES bytes. passwdlen should be at least crypto_pwhash_
      * PASSWD_MIN and crypto_pwhash_PASSWD_MAX. outlen should be at least crypto_pwhash_BYTES_MIN = 16 (128 bits) and
      * at most crypto_pwhash_BYTES_MAX.
      *

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/util/LibsodiumUtil.kt

@@ -93,7 +93,7 @@ actual object LibsodiumUtil {
     actual fun fromHex(data: String): UByteArray {
         val binLenReference = IntByReference(0)
         val binSize = (data.length + 1) / 2 // -1 for terminator char
-        val hex = data.toCharArray().map { it.toByte() }.toByteArray()
+        val hex = data.toCharArray().map { it.code.toByte() }.toByteArray()
         val result = ByteArray(binSize)
         val resultCode = sodiumJna.sodium_hex2bin(
             result,