Update CI to use the new 2.2.x maintenance branch

Author: wilkinsona

ci/parameters.yml

@@ -5,7 +5,7 @@ github-repo: "https://github.com/spring-projects/spring-boot.git"
 github-repo-name: "spring-projects/spring-boot"
 docker-hub-organization: "springci"
 artifactory-server: "https://repo.spring.io"
-branch: "master"
+branch: "2.2.x"
 build-name: "spring-boot"
 pipeline-name: "spring-boot"
 concourse-url: "https://ci.spring.io"