Update dependency com.google.code.gson:gson to v2.8.9 [SECURITY] (#288)

Author: renovatebot-confluentinc[bot]

scalable-payment-processing/pom.xml

@@ -90,7 +90,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
         <dependency>
             <groupId>org.glassfish</groupId>

streaming-pacman/terraform/aws/functions/pom.xml

@@ -17,7 +17,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.6</version>
+            <version>2.8.9</version>
         </dependency>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>