(2.3.x): Bump openServiceBrokerVersion from 4.3.0 to 4.3.1

Bumps `openServiceBrokerVersion` from 4.3.0 to 4.3.1.

Updates `org.springframework.cloud:spring-cloud-open-service-broker-core` from 4.3.0 to 4.3.1
- [Release notes](https://github.com/spring-cloud/spring-cloud-open-service-broker/releases)
- [Commits](spring-cloud/spring-cloud-open-service-broker@v4.3.0...v4.3.1)

Updates `org.springframework.cloud:spring-cloud-starter-open-service-broker` from 4.3.0 to 4.3.1
- [Release notes](https://github.com/spring-cloud/spring-cloud-open-service-broker/releases)
- [Commits](spring-cloud/spring-cloud-open-service-broker@v4.3.0...v4.3.1)

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

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

Author: dependabot[bot]

build.gradle

@@ -22,7 +22,7 @@ buildscript {
 		cfJavaClientVersion = "5.12.2.RELEASE"
 		commonsTextVersion = "1.12.0"
 		immutablesVersion = "2.10.1"
-		openServiceBrokerVersion = "4.3.0"
+		openServiceBrokerVersion = "4.3.1"
 		wiremockVersion = "3.9.2"
 	}
 }