Switch testing to Xena testing runtime for nodejs

Upating the testing template to Xena testing runtime:

https: //governance.openstack.org/tc/reference/runtimes/xena.html
Change-Id: Ic0527d19437711a5b29b82c8b84bf8244cb7646b

.zuul.yaml

@@ -1,20 +1,20 @@
 - job:
-    name: openstack-health-nodejs10-run-lint
+    name: openstack-health-nodejs14-run-lint
     parent: nodejs-run-lint
     description: |
-      Run lint using Node 10.
+      Run lint using Node 14.
     vars:
-      node_version: 10
+      node_version: 14
     nodeset: ubuntu-focal
     pre-run: playbooks/nodejs/pre.yaml
     required-projects:
       - openstack/openstack-health
 
 - job:
-    name: openstack-health-nodejs10-run-test-browser
+    name: openstack-health-nodejs14-run-test-browser
     parent: nodejs-run-test-browser
     vars:
-      node_version: 10
+      node_version: 14
     nodeset: ubuntu-focal
     pre-run: playbooks/nodejs/pre.yaml
     required-projects:
@@ -25,9 +25,9 @@
       - build-openstack-docs-pti
     check:
       jobs:
-      - openstack-health-nodejs10-run-lint
-      - openstack-health-nodejs10-run-test-browser
+      - openstack-health-nodejs14-run-lint
+      - openstack-health-nodejs14-run-test-browser
     gate:
       jobs:
-      - openstack-health-nodejs10-run-lint
-      - openstack-health-nodejs10-run-test-browser
+      - openstack-health-nodejs14-run-lint
+      - openstack-health-nodejs14-run-test-browser

package.json

@@ -35,7 +35,8 @@
     "eslint-plugin-angular": "0.12.0",
     "express": "^4.7.2",
     "fancy-log": "^1.3.2",
-    "gulp": "^3.8.8",
+    "graceful-fs": "^4.2.2",
+    "gulp": "^4.0.2",
     "gulp-angular-templatecache": "^1.3.0",
     "gulp-autoprefixer": "^2.0.0",
     "gulp-changed": "^1.0.0",