Update CI pipeline to 6.0.x branch

Author: bclozel

ci/parameters.yml

@@ -3,7 +3,7 @@ github-repo-name: "spring-projects/spring-framework"
 sonatype-staging-profile: "org.springframework"
 docker-hub-organization: "springci"
 artifactory-server: "https://repo.spring.io"
-branch: "main"
+branch: "6.0.x"
 milestone: "6.0.x"
 build-name: "spring-framework"
 pipeline-name: "spring-framework"