Bump io.spring.dependency-management (#743)

Bumps the development-dependencies group with 1 update: [io.spring.dependency-management](https://github.com/spring-gradle-plugins/dependency-management-plugin).


Updates `io.spring.dependency-management` from 1.1.5 to 1.1.6
- [Release notes](https://github.com/spring-gradle-plugins/dependency-management-plugin/releases)
- [Commits](https://github.com/spring-gradle-plugins/dependency-management-plugin/compare/v1.1.5...v1.1.6)

---
updated-dependencies:
- dependency-name: io.spring.dependency-management
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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

gradle/libs.versions.toml

@@ -21,7 +21,7 @@ json-path = "2.9.0"
 junit = "5.10.3"
 hamcrest = "2.2"
 mockito = "5.12.0"
-spring-dep-mgmt = "1.1.5"
+spring-dep-mgmt = "1.1.6"
 spring-boot = "3.2.8-SNAPSHOT"
 spring-boot-for-docs = "3.2.8-SNAPSHOT"
 spring-cloud-stream = "4.1.0"