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/java-saml-2.9.0/README

@@ -0,0 +1,8 @@
+Onelogin Java SAML Client (https://github.com/onelogin/java-saml)
+------------------------------------------------------------------------
+
+    Version: 2.9.0
+    From: 'OneLogin' (https://www.onelogin.com)
+    License(s):
+        MIT License (bundled/java-saml-2.9.0/LICENSE)
+