[stable/concourse] Bump imageTag to match actual released version (#16983)

Signed-off-by: pikesley <sam.pikesley@demandlogic.co.uk>

stable/concourse/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: concourse
-version: 8.2.4
+version: 8.2.5
 appVersion: 5.5.0
 description: Concourse is a simple and scalable CI system.
 icon: https://avatars1.githubusercontent.com/u/7809479

stable/concourse/values.yaml

@@ -19,7 +19,7 @@ image: concourse/concourse
 ##      of `concourse/concourse`.
 ## Ref: https://hub.docker.com/r/concourse/concourse/tags/
 ##
-imageTag: "5.4.1"
+imageTag: "5.5.0"
 
 ## Specific image digest to use in place of a tag.
 ## Ref: https://kubernetes.io/docs/concepts/configuration/overview/#container-images