Bump sample to use latest snapshot and add some encryption/decryption to binary

buildSrc/src/main/kotlin/Deps.kt

@@ -25,7 +25,7 @@ object Versions {
     val kotlinBigNumVersion = "0.3.7"
     val jna = "5.10.0"
     val kotlinPoet = "1.6.0"
-    val sampleLibsodiumBindings = "0.8.5-SNAPSHOT"
+    val sampleLibsodiumBindings = "0.8.8-SNAPSHOT"
     val ktor = "1.3.2"
     val timber = "4.7.1"
     val kodeinVersion = "7.1.0"