Create 1.2.x Concourse pipeline

This commit also upgrades Concourse resources to their latest versions.

ci/parameters.yml

@@ -3,7 +3,7 @@ github-repo-name: "spring-projects/spring-graphql"
 docker-hub-organization: "springci"
 artifactory-server: "https://repo.spring.io"
 branch: "main"
-milestone: "1.1.x"
+milestone: "1.2.x"
 build-name: "spring-graphql"
 pipeline-name: "spring-graphql"
 concourse-url: "https://ci.spring.io"

ci/pipeline.yml

@@ -25,7 +25,7 @@ resource_types:
   type: registry-image
   source:
     repository: concourse/registry-image-resource
-    tag: 1.5.0
+    tag: 1.7.1
 - name: artifactory-resource
   type: registry-image
   source:
@@ -35,7 +35,7 @@ resource_types:
   type: registry-image
   source:
     repository: concourse/github-release-resource
-    tag: 1.5.5
+    tag: 1.8.0
 
 resources:
 - name: git-repo