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.

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-cas/pom.xml

@@ -59,10 +59,11 @@
             <exclusions>
 
                 <!-- Resolve version conflict (see below - transitive
-                    dependencies of cas-client-core disagree on 2.3.0 vs. 2.3.1) -->
+                dependencies of cas-client-core disagree on 2.3.0.1 vs.
+                2.3.1) -->
                 <exclusion>
-                    <groupId>javax.xml.bind</groupId>
-                    <artifactId>jaxb-api</artifactId>
+                    <groupId>org.glassfish.jaxb</groupId>
+                    <artifactId>jaxb-core</artifactId>
                 </exclusion>
 
             </exclusions>