(v3.5.x): Bump springCloudContractVersion from 3.1.8 to 3.1.9

Bumps `springCloudContractVersion` from 3.1.8 to 3.1.9.

Updates `org.springframework.cloud:spring-cloud-contract-dependencies` from 3.1.8 to 3.1.9
- [Release notes](https://github.com/spring-cloud/spring-cloud-build/releases)
- [Commits](spring-cloud/spring-cloud-build@v3.1.8...v3.1.9)

Updates `org.springframework.cloud.contract` from 3.1.8 to 3.1.9

---
updated-dependencies:
- dependency-name: org.springframework.cloud:spring-cloud-contract-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.cloud.contract
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -24,7 +24,7 @@ buildscript {
 		beanUtilsVersion = "1.9.4"
 
 		// Test Dependencies
-		springCloudContractVersion = "3.1.8"
+		springCloudContractVersion = "3.1.9"
 		javaHamcrestVersion = "2.0.0.0"
 		equalsVerifierVersion = "3.15.3"
 		findbugsVersion = "3.0.1"