Fix CI image resource in pipeline

This commit fixes the CI image resource configuration so that it can be
checked autmatically by the pipeline.
This also updates various resources.

ci/pipeline.yml

@@ -45,19 +45,19 @@ resource_types:
   source:
     <<: *docker-resource-source
     repository: concourse/registry-image-resource
-    tag: 1.5.0
+    tag: 1.7.1
 - name: artifactory-resource
   type: registry-image
   source:
     <<: *docker-resource-source
     repository: springio/artifactory-resource
-    tag: 0.0.17
+    tag: 0.0.18
 - name: github-release
   type: registry-image
   source:
     <<: *docker-resource-source
     repository: concourse/github-release-resource
-    tag: 1.5.5
+    tag: 1.8.0
 - name: github-status-resource
   type: registry-image
   source:
@@ -102,6 +102,7 @@ resources:
   source:
     <<: *docker-resource-source
     repository: ((docker-hub-organization))/spring-framework-ci
+    tag: ((milestone))
 - name: artifactory-repo
   type: artifactory-resource
   icon: package-variant
@@ -169,7 +170,6 @@ jobs:
         image: ci-image
       vars:
         ci-image-name: ci-image
-        tag: ((milestone))
         <<: *docker-resource-source
     - put: ci-image
       params: