Squashed commit of the following

commit 2265f49a 
Author: David Meng <xlmeng@amazon.com> 
Date: Tue Sep 27 2022 10:52:17 GMT-0400 (Eastern Daylight Time) 

    Upgrade Gson

notification-core/pom.xml

@@ -176,7 +176,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.9</version>
+            <version>2.9.1</version>
         </dependency>
 
          <dependency>

testing/notification-test-core/pom.xml

@@ -120,7 +120,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.9.1</version>
         </dependency>
         <dependency>
             <groupId>com.google.auth</groupId>