Bump com.google.code.gson:gson from 2.11.0 to 2.12.1 in /Plan (#3957)

Bumps [com.google.code.gson:gson](https://github.com/google/gson) from 2.11.0 to 2.12.1.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/main/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.11.0...gson-parent-2.12.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Plan/build.gradle

@@ -81,7 +81,7 @@ subprojects {
         hikariVersion = "6.2.1"
         slf4jVersion = "2.0.16"
         geoIpVersion = "4.2.1"
-        gsonVersion = "2.11.0"
+        gsonVersion = "2.12.1"
         dependencyDownloadVersion = "1.3.1"
         ipAddressMatcherVersion = "5.5.1"
         jasyptVersion = "1.9.3"