ci: backport workflow fixe from graphql-js (#306)

Author: IvanGoncharov

.github/workflows/ci.yml

@@ -113,6 +113,9 @@ jobs:
       - name: Install Dependencies
         run: npm ci --ignore-scripts
 
+      - name: Check that package-lock.json doesn't have conflicts
+        run: npm ls --depth 999
+
       - name: Run npm install
         run: npm install --ignore-scripts --force --package-lock-only --engine-strict --strict-peer-deps