Bump com.google.code.gson:gson from 2.12.1 to 2.13.1

Bumps [com.google.code.gson:gson](https://github.com/google/gson) from 2.12.1 to 2.13.1.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/main/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.12.1...gson-parent-2.13.1)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-version: 2.13.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -39,7 +39,7 @@ java {
 ext {
   lombokVersion = '1.18.38'
   gocdPluginApiVersion = '25.1.0'
-  gsonVersion = '2.12.1'
+  gsonVersion = '2.13.1'
 }
 
 dependencies {