make the dependabot k8s.io group explicit

Signed-off-by: Joe Julian <me@joejulian.name>

.github/dependabot.yml

@@ -8,11 +8,13 @@ updates:
     groups:
       k8s.io:
         patterns:
-          - "k8s.io/*"
+          - "k8s.io/api"
-        exclude-patterns:
+          - "k8s.io/apiextensions-apiserver"
-          - "k8s.io/utils"
+          - "k8s.io/apimachinery"
-          - "k8s.io/klog/v2"
+          - "k8s.io/apiserver"
-          - "k8s.io/kube-openapi"
+          - "k8s.io/cli-runtime"
+          - "k8s.io/client-go"
+          - "k8s.io/kubectl"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule: