Bump spring-boot.version from 3.5.5 to 3.5.6

Bumps `spring-boot.version` from 3.5.5 to 3.5.6.

Updates `org.springframework.boot:spring-boot-starter-parent` 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)

Updates `org.springframework.boot:spring-boot-maven-plugin` 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-starter-parent
  dependency-version: 3.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  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

@@ -129,7 +129,7 @@
     <!-- Run Docker build by default -->
     <skipDocker>false</skipDocker>
     <sortpom-maven-plugin.version>4.0.0</sortpom-maven-plugin.version>
-    <spring-boot.version>3.5.5</spring-boot.version>
+    <spring-boot.version>3.5.6</spring-boot.version>
     <testcontainers.version>1.21.3</testcontainers.version>
     <testng.version>7.11.0</testng.version>
     <xmlunit-assertj3.version>2.10.4</xmlunit-assertj3.version>