GUACAMOLE-736: Replace JAXB DatatypeConverter with Guava BaseEncoding.

extensions/guacamole-auth-duo/pom.xml

@@ -216,6 +216,13 @@
             <version>1.1.0</version>
             <scope>provided</scope>
         </dependency>
+        
+        <!-- Guava - Utility Library -->
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>27.0.1-jre</version>
+        </dependency>
 
         <!-- Guice -->
         <dependency>
@@ -237,13 +244,6 @@
             <scope>provided</scope>
         </dependency>
 
-        <!-- Java XML -->
-        <dependency>
-            <groupId>javax.xml.bind</groupId>
-            <artifactId>jaxb-api</artifactId>
-            <version>2.3.1</version>
-        </dependency>
-
     </dependencies>
 
 </project>