Bump client versions (#727)

Update guava and jetty to fix security warnings.

Signed-off-by: SuperQ <[email protected]>

Author: SuperQ

simpleclient_guava/pom.xml

@@ -41,7 +41,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>18.0</version>
+            <version>31.0.1-jre</version>
         </dependency>
 
 

simpleclient_jetty_jdk8/pom.xml

@@ -52,12 +52,12 @@
         <dependency>
             <groupId>org.eclipse.jetty</groupId>
             <artifactId>jetty-server</artifactId>
-            <version>9.4.4.v20170414</version>
+            <version>9.4.44.v20210927</version>
         </dependency>
         <dependency>
             <groupId>org.eclipse.jetty</groupId>
             <artifactId>jetty-servlet</artifactId>
-            <version>9.4.4.v20170414</version>
+            <version>9.4.44.v20210927</version>
         </dependency>
         <!-- Test Dependencies Follow -->
         <dependency>