Top-level uses for GH actions

.github/workflows/jest-tests.yml

@@ -9,16 +9,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js
-      uses: actions/setup-node@v1
+    - uses: actions/setup-node@v2
       with:
-        node-version: '12.x'
+        node-version: '12'
     - name: Install Code Climate test-reporter
       run: |
         curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
         chmod +x ./cc-test-reporter
     - name: Install modules
-      run: npm install
+      run: npm ci
     - name: Run tests
       run: |
         ./cc-test-reporter before-build

package.json

@@ -57,7 +57,7 @@
     "babel-plugin-react-element-info": "^1",
     "cheerio-select": "^1.4.0",
     "copy-dir": "^1.3.0",
-    "core-js": "^2.6.12",
+    "core-js": "^3.18",
     "css-loader": "^5.2.4",
     "enzyme": "^3.11.0",
     "enzyme-adapter-react-16": "^1.15.5",