update CI: Node.js 16.x end-of-life (#26)

Author: Eskibear

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - uses: actions/checkout@v3

azure-pipelines.yml

@@ -12,7 +12,7 @@ pool:
 steps:
 - task: NodeTool@0
   inputs:
-    versionSpec: '16.x'
+    versionSpec: '18.x'
   displayName: 'Install Node.js'
 
 - script: |