use Node 18

Author: Chiu Peter

.github/workflows/jest_tests.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 18.x
           registry-url: https://registry.npmjs.org/
           scope: '@mat-github-ci'
         env: