Bump com.google.code.gson dependency to version 2.9.1

PiperOrigin-RevId: 466737175
Change-Id: I929d3fb49c5c6a8d396fccd30b99095359325195

Author: jasonborg

src/agent/internals/pom.xml

@@ -42,7 +42,7 @@
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
-      <version>2.8.7</version>
+      <version>2.9.1</version>
     </dependency>
     <dependency>
       <groupId>javax.xml.bind</groupId>

src/codegen/pom.xml

@@ -21,7 +21,7 @@
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
-      <version>RELEASE</version>
+      <version>2.9.1</version>
     </dependency>
     <dependency>
       <groupId>org.freemarker</groupId>