Bump org.springframework.modulith:spring-modulith-bom

Bumps [org.springframework.modulith:spring-modulith-bom](https://github.com/spring-projects/spring-modulith) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/spring-projects/spring-modulith/releases)
- [Commits](spring-projects/spring-modulith@1.2.3...1.2.4)

---
updated-dependencies:
- dependency-name: org.springframework.modulith:spring-modulith-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/pom.xml

@@ -23,7 +23,7 @@
 
         <spring.boot.version>3.3.1</spring.boot.version>
         <flyway.version>10.18.0</flyway.version>
-        <spring.modulith.version>1.2.3</spring.modulith.version>
+        <spring.modulith.version>1.2.4</spring.modulith.version>
         <jjwt.version>0.12.6</jjwt.version>
         <postgresql.driver.version>42.7.4</postgresql.driver.version>
         <mysql.driver.version>9.0.0</mysql.driver.version>