GUACAMOLE-1594: Update all Java and JavaScript dependencies to latest compatible.

NOTE: Several WebPack plugins could not be updated as all plugins within
WebPack's "webpack-contrib" have dropped support for WebPack v4
entirely, but Closure Compiler only supports WebPack v4.

doc/licenses/kotlinx-serialization-1.3.3/README

@@ -0,0 +1,8 @@
+Kotlin Serialization (https://github.com/Kotlin/kotlinx.serialization)
+----------------------------------------------------------------------
+
+    Version: 1.3.3
+    From: 'JetBrains s.r.o and respective authors and developers'
+    License(s):
+        Apache v2.0
+