install dependencies so that reconfigure works

.github/workflows/dependabot-sync.yml

@@ -21,6 +21,10 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
+      - name: Install dependencies
+        run: npx lerna bootstrap
+        env:
+          CI: true
       - name: Run Sync Script
         run: node ./scripts/sync-dependencies.mjs ${{ github.head_ref }}
       - name: Reconfigure