mastodon: bump to v4.5.3, helm chart 6.6.3

mastodon/.github/workflows/test-chart.yml

@@ -75,21 +75,21 @@ jobs:
           # available for use in the templates, currently we need v3.6.0 or
           # higher.
           #
-          - k3s-channel: v1.28
-            helm-version: v3.8.0
+          - k3s-channel: v1.33
+            helm-version: v3.19.0
 
     env:
       HELM_EXPERIMENTAL_OCI: "1"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
 
       # This action starts a k8s cluster with NetworkPolicy enforcement and
       # installs both kubectl and helm.
       #
       # ref: https://github.com/jupyterhub/action-k3s-helm#readme
       #
-      - uses: jupyterhub/action-k3s-helm@v3
+      - uses: jupyterhub/action-k3s-helm@v4
         with:
           k3s-channel: ${{ matrix.k3s-channel }}
           helm-version: ${{ matrix.helm-version }}