Bump k8s versions for ci workflow (#156)

.github/workflows/helm-chart-ci.yaml

@@ -130,9 +130,10 @@ jobs:
         # Kubernetes, but can go back farther as long as we don't need heroics
         # to pull it off (i.e. kubectl version juggling).
         k8s:
-          - v1.27.2
-          - v1.26.4
-          - v1.25.9
+          - v1.29.0
+          - v1.28.0
+          - v1.27.3
+          - v1.26.6
 
     steps:
       - name: Checkout
@@ -209,9 +210,10 @@ jobs:
       fail-fast: false
       matrix:
         k8s:
-          - v1.27.2
-          - v1.26.4
-          - v1.25.9
+          - v1.29.0
+          - v1.28.0
+          - v1.27.3
+          - v1.26.6
         example:
           - ${{ fromJson(needs.build-matrix.outputs.examples) }}
 
@@ -255,9 +257,10 @@ jobs:
       fail-fast: false
       matrix:
         k8s:
-          - v1.27.2
-          - v1.26.4
-          - v1.25.9
+          - v1.29.0
+          - v1.28.0
+          - v1.27.3
+          - v1.26.6
 
     steps:
       - name: Checkout