chore: fix Node 8 support

Author: ehmicky

.github/workflows/workflow.yml

@@ -28,7 +28,8 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install dependencies
-        run: npm ci
+        # TODO: switch to `npm ci` after dropping support for Node 8
+        run: npm install
       - name: Linting
         run: npm run format:ci
         if: "${{ matrix.node-version == '15.x' }}"