jsonnet: Update to latest kubernetes-mixin

Pick up new alerts for unreachable nodes.

examples/additional-namespaces-servicemonitor.jsonnet

@@ -1,33 +1,33 @@
 local kp = (import 'kube-prometheus/kube-prometheus.libsonnet') + {
   _config+:: {
-      namespace: 'monitoring',
-      prometheus+:: {
-        namespaces+: ['my-namespace', 'my-second-namespace'],
-      }
-    },
+    namespace: 'monitoring',
     prometheus+:: {
-      serviceMonitorMyNamespace: {
-          apiVersion: 'monitoring.coreos.com/v1',
-          kind: 'ServiceMonitor',
-          metadata: {
-              name: 'my-servicemonitor',
-              namespace: 'my-namespace',
+      namespaces+: ['my-namespace', 'my-second-namespace'],
+    },
+  },
+  prometheus+:: {
+    serviceMonitorMyNamespace: {
+      apiVersion: 'monitoring.coreos.com/v1',
+      kind: 'ServiceMonitor',
+      metadata: {
+        name: 'my-servicemonitor',
+        namespace: 'my-namespace',
+      },
+      spec: {
+        jobLabel: 'app',
+        endpoints: [
+          {
+            port: 'http-metrics',
           },
-          spec: {
-              jobLabel: 'app',
-              endpoints: [
-              {
-                  port: 'http-metrics',
-              },
-              ],
-              selector: {
-                  matchLabels: {
-                      'app': 'myapp',
-                  },
-              },
+        ],
+        selector: {
+          matchLabels: {
+            app: 'myapp',
           },
         },
-      },      
+      },
+    },
+  },
 
 };