ci: remove node.js version matrix (#1519)

We only check if the TypeScript successfully compiles & lints, which isn't really dependent on Node.js version.

Reviewed-on: OpenWF/SpaceNinjaServer#1519
Co-authored-by: Sainan <63328889+Sainan@users.noreply.github.com>
Co-committed-by: Sainan <63328889+Sainan@users.noreply.github.com>

.github/workflows/build.yml

@@ -5,16 +5,11 @@ on:
 jobs:
     build:
         runs-on: ubuntu-latest
-        strategy:
-            matrix:
-                version: [18, 20, 22]
         steps:
             - name: Checkout
               uses: actions/checkout@v4.1.2
             - name: Setup Node.js environment
               uses: actions/setup-node@v4.0.2
-              with:
-                  node-version: ${{ matrix.version }}
             - run: npm ci
             - run: cp config.json.example config.json
             - run: npm run verify