ci: Select Node.js versions dynamically

.github/workflows/build.yml

@@ -42,11 +42,20 @@ permissions:
   contents: read
 
 jobs:
+  prepare_matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.generate-matrix.outputs.versions }}
+    steps:
+    - name: Select 3 most recent LTS versions of Node.js
+      id: generate-matrix
+      run: echo "versions=$(curl -s https://endoflife.date/api/nodejs.json | jq -c '[[.[] | select(.lts != false)][:3] | .[].cycle | tonumber]')" >> "$GITHUB_OUTPUT"
+
   test:
     name: Tests
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: ${{ fromJSON(needs.prepare_matrix.outputs.versions) }}
         os:
         - ubuntu-latest
         # TODO: Windows is not stable and slow to run