Bump gson from 2.8.5 to 2.8.9 in /examples/java (#109)

diff --git a/examples/java/pom.xml b/examples/java/pom.xml
index 1c312ba..7598320 100644
--- a/examples/java/pom.xml
+++ b/examples/java/pom.xml
@@ -15,7 +15,7 @@
         <dependency>
           <groupId>com.google.code.gson</groupId>
           <artifactId>gson</artifactId>
-          <version>2.8.5</version>
+          <version>2.8.9</version>
         </dependency>
     </dependencies>