Use 16vcpu node for plugin jobs

We're using this for the gerrit build, we may as well for the plugins
as well.

Change-Id: Id3cc1b03d44294433c16eecea55f2f1723439607
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 66c1404..550a83a 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -62,6 +62,10 @@
 
          The bazelisk targets to test.
     run: playbooks/gerrit-plugin/build.yaml
+    nodeset:
+      nodes:
+        - name: testnode
+          label: debian-stretch-60G
     vars:
       gerrit_plugin: "{{ zuul.project.short_name }}"
       bazelisk_targets: "plugins/{{ gerrit_plugin }}:{{ gerrit_plugin }}"