CI: increase parallelism and upgrade GH action (#461)

Author: guidoiaquinti

.github/workflows/test-k6.yaml

@@ -52,7 +52,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: jupyterhub/action-k3s-helm@v2
+      - uses: jupyterhub/action-k3s-helm@v3
         with:
           k3s-channel: ${{ matrix.k3s-channel }}
           metrics-enabled: false

.github/workflows/test-kubetest-store-durations.yaml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v3
         name: Checkout
 
-      - uses: jupyterhub/action-k3s-helm@v2
+      - uses: jupyterhub/action-k3s-helm@v3
         with:
           k3s-channel: v1.22
           metrics-enabled: false

.github/workflows/test-kubetest.yaml

@@ -20,15 +20,15 @@ jobs:
     strategy:
         fail-fast: false
         matrix:
-            # :NOTE: Keep concurrency and group's in sync
-            concurrency: [10]
-            group: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+            # NOTE: Keep concurrency and group's in sync
+            concurrency: [20]
+            group: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
 
     steps:
       - uses: actions/checkout@v3
         name: Checkout
 
-      - uses: jupyterhub/action-k3s-helm@v2
+      - uses: jupyterhub/action-k3s-helm@v3
         with:
           k3s-channel: v1.22
           metrics-enabled: false