feat(helm): release check on most-supported Kubernetes version (#848)

Since Kubernetes 1.22, there was never a big need to actually upgrade
REANA source code to make it work on new Kubernetes releases. (This is
thanks to the fact that REANA uses pretty stable Kubernetes API
internally.) This commit therefore releases the upper boundary check on
the supported Kubernetes versions in order to be more welcoming to
future Kubernetes upgrades, alleviating the need to manually bump the
supported version number.

helm/reana/Chart.yaml

@@ -27,7 +27,7 @@ keywords:
   - reusable-science
 type: application
 version: 0.9.3
-kubeVersion: '>= 1.21.0-0 < 1.32.0-0'
+kubeVersion: '>= 1.21.0-0'
 dependencies:
   - name: traefik
     version: 10.6.2