fix: simplify workflow

Author: wtrocki

.github/workflows/build.yaml

@@ -13,15 +13,12 @@ on:
 jobs:
   rules-build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node-version: [14.x]
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v3
       with:
-        node-version: ${{ matrix.node-version }}
+        node-version: 16
     - run: yarn install
     - working-directory: ./spectral
       run: yarn build