Bump io.spring.gradle:dependency-management-plugin from 1.1.4 to 1.1.6

Bumps [io.spring.gradle:dependency-management-plugin](https://github.com/spring-gradle-plugins/dependency-management-plugin) from 1.1.4 to 1.1.6.
- [Release notes](https://github.com/spring-gradle-plugins/dependency-management-plugin/releases)
- [Commits](spring-gradle-plugins/dependency-management-plugin@v1.1.4...v1.1.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
     dependencies {
         classpath "com.github.ben-manes:gradle-versions-plugin:0.36.0"
-        classpath "io.spring.gradle:dependency-management-plugin:1.1.4"
+        classpath "io.spring.gradle:dependency-management-plugin:1.1.6"
         classpath "org.jfrog.buildinfo:build-info-extractor-gradle:4.28.2"
         classpath 'org.hidetake:gradle-ssh-plugin:2.10.1'
         classpath 'io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.30.0'