Upgrade NPM to v9 (#599)

Author: kenk2

Diff for: .github/actions/setup/action.yml

@@ -7,6 +7,12 @@ runs:
       uses: actions/setup-node@v3
       with:
         node-version: 14.x
+    - name: Setup NPM v9
+      shell: bash
+      run: npm install -g npm@9
+    - name: Check Node & NPM versions
+      shell: bash
+      run: node -v && npm -v
     - name: Clean Environment
       shell: bash
       run: npm run clean

Diff for: .npmrc

@@ -1 +1,2 @@
 package-lock=false
+legacy-peer-deps=true

Diff for: package.json

@@ -9,7 +9,8 @@
     "url": "https://github.com/cerner/terra-ui/issues"
   },
   "engines": {
-    "node": "^12.0.0 || ^14.0.0"
+    "node": "12 || 14",
+    "npm": "6 || 9"
   },
   "repository": {
     "type": "git",