build(deps): bump org.springframework.boot from 3.5.5 to 3.5.6 (#265)

Bumps [org.springframework.boot](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
  dependency-version: 3.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 java = "21"
-spring-boot = "3.5.5"
+spring-boot = "3.5.6"
 spring-dependency-management = "1.1.7"
 openapi-generator = "7.15.0"
 openapi-tools = "0.2.7"