Bump openServiceBrokerVersion from 3.5.3 to 3.6.0

Bumps `openServiceBrokerVersion` from 3.5.3 to 3.6.0.

Updates `org.springframework.cloud:spring-cloud-open-service-broker-core` from 3.5.3 to 3.6.0
- [Release notes](https://github.com/spring-cloud/spring-cloud-open-service-broker/releases)
- [Commits](spring-cloud/spring-cloud-open-service-broker@v3.5.3...v3.6.0)

Updates `org.springframework.cloud:spring-cloud-starter-open-service-broker` from 3.5.3 to 3.6.0
- [Release notes](https://github.com/spring-cloud/spring-cloud-open-service-broker/releases)
- [Commits](spring-cloud/spring-cloud-open-service-broker@v3.5.3...v3.6.0)

---
updated-dependencies:
- dependency-name: org.springframework.cloud:spring-cloud-open-service-broker-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springframework.cloud:spring-cloud-starter-open-service-broker
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -24,7 +24,7 @@ buildscript {
 		checkstyleVersion = "8.37"
 		commonsTextVersion = "1.10.0"
 		immutablesVersion = "2.9.3"
-		openServiceBrokerVersion = "3.5.3"
+		openServiceBrokerVersion = "3.6.0"
 		pmdVersion = "6.29.0"
 		springBootVersion = "2.7.8"
 		springCredhubVersion = "2.3.0"