build(deps): bump spring-cloud-dependencies

Bumps [spring-cloud-dependencies](https://github.com/spring-cloud/spring-cloud-build) from Hoxton.SR7 to Hoxton.SR8.
- [Release notes](https://github.com/spring-cloud/spring-cloud-build/releases)
- [Commits](https://github.com/spring-cloud/spring-cloud-build/commits)

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

Author: dependabot-preview[bot]

build.gradle

@@ -23,7 +23,7 @@ repositories {
 
 dependencyManagement {
     imports {
-        mavenBom "org.springframework.cloud:spring-cloud-dependencies:Hoxton.SR7"
+        mavenBom "org.springframework.cloud:spring-cloud-dependencies:Hoxton.SR8"
     }
 }