ci: ensure we have a test against k8s 1.22

Author: consideRatio

.github/workflows/test-chart.yaml

@@ -190,7 +190,7 @@ jobs:
             local-chart-extra-args: >-
               --set hub.db.type=sqlite-pvc
               --set singleuser.storage.type=dynamic
-          - k3s-channel: v1.24
+          - k3s-channel: v1.22
             k3s-extra-setup-args: --egress-selector-mode=disabled
             test: upgrade
             # We're testing hub.db.upgrade with PostgreSQL so this version must be old