build(deps): bump org.springframework.boot:spring-boot-dependencies

Bumps [org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot) from 3.5.5 to 3.5.6.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.5...v3.5.6)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-version: 3.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -73,7 +73,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>21</java.version>
-    <spring-boot.version>3.5.5</spring-boot.version>
+    <spring-boot.version>3.5.6</spring-boot.version>
     <ff4j.version>2.1</ff4j.version>
     <jackson-module-kotlin.version>2.20.0</jackson-module-kotlin.version>
     <kotlin.version>2.2.10</kotlin.version>