Update com.google.code.gson:gson to version 2.12.1 (#3429)

Author: asf-rm

log4j-core-test/pom.xml

@@ -83,7 +83,7 @@
       <dependency>
         <groupId>com.google.code.gson</groupId>
         <artifactId>gson</artifactId>
-        <version>2.11.0</version>
+        <version>2.12.1</version>
       </dependency>
 
     </dependencies>

src/changelog/.3.x.x/update_com_google_code_gson_gson.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="updated">
+  <issue id="3429" link="https://github.com/apache/logging-log4j2/pull/3429"/>
+  <description format="asciidoc">Update `com.google.code.gson:gson` to version `2.12.1`</description>
+</entry>