Bump io.spring.dependency-management in /in-person-payments-example

Bumps [io.spring.dependency-management](https://github.com/spring-gradle-plugins/dependency-management-plugin) from 1.1.3 to 1.1.6.
- [Release notes](https://github.com/spring-gradle-plugins/dependency-management-plugin/releases)
- [Commits](spring-gradle-plugins/dependency-management-plugin@v1.1.3...v1.1.6)

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

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

in-person-payments-example/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'org.springframework.boot' version '3.1.4'
-    id 'io.spring.dependency-management' version '1.1.3'
+    id 'io.spring.dependency-management' version '1.1.6'
 
     id 'java'
 }