Update nodeunit x (#75)

* Bump version in package-lock.json

* Bump nodeunit-x to `^0.16.0`

* (dependabot) update GH actions

* (actions) use V3 of checkout and setup-node

* (actions) run also on Node 18

Author: MatthijsBurgh

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/test.yml

@@ -13,15 +13,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 14, 16]
+        node: [12, 14, 16, 18]
         os: [ubuntu-latest, windows-latest]
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node }}