chore: Bump io.freefair.lombok from 8.12.2 to 8.12.2.1 in /backend

Bumps [io.freefair.lombok](https://github.com/freefair/gradle-plugins) from 8.12.2 to 8.12.2.1.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.12.2...8.12.2.1)

---
updated-dependencies:
- dependency-name: io.freefair.lombok
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/build.gradle

@@ -3,7 +3,7 @@ plugins {
     id "idea"
     id "org.springframework.boot" version "3.4.3"
     id "io.spring.dependency-management" version "1.1.7"
-    id "io.freefair.lombok" version "8.12.2"
+    id "io.freefair.lombok" version "8.12.2.1"
     id "com.github.spotbugs" version "6.1.0"
     id "com.github.ben-manes.versions" version "0.52.0"
     id "org.owasp.dependencycheck" version "8.4.3"