👷 Use node 20 in GitHub Actions

Fixes https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

Author: tolauwae

.github/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
 
       - name: Build warduino cli
         run: |
@@ -86,7 +86,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
 
       - name: Build warduino cli
         run: |
@@ -128,7 +128,7 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
 
       - name: Build warduino cli
         run: |