Chore/npm 18 upgrade (#66)

Will now use node 18.17.1 & npm 9

Unable to upgrade to node 20 & npm 10:
- Azure static sites offer support up to node 20/npm 10
- Azure functions offer support up to node 18/npm 9

.github/workflows/coverage.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x]
+        node-version: [18.17.x]
 
     steps:
     - name: Checkout repository

.pipelines/app/templates/npmInstall.yml

@@ -1,7 +1,7 @@
 steps:
   - task: NodeTool@0
     inputs:
-      versionSpec: '16.19.x'
+      versionSpec: '18.17.x'
 
   - task: Cache@2
     displayName: Cache npm

package.json

@@ -5,8 +5,8 @@
   "private": true,
   "description": "This repo serves at a boilerplate to help stand up a new nextjs app",
   "engines": {
-    "node": "=16",
-    "npm": "=8"
+    "node": "=18.17.x",
+    "npm": "=9"
   },
   "scripts": {
     "prepare": "husky install",