ci: remove custom workflow

.github/workflows/tests.yml

@@ -1,31 +0,0 @@
-name: Tests
-
-on:
-  push:
-  pull_request:
-
-jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [20]
-
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
-        with:
-          node-version: ${{ matrix.node-version }}
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Build
-        run: npm run build
-
-      - name: Run tests
-        run: npm test