fix: add --frozen-lockfile flag to jlpm install in CI

Ensures dependencies are installed exactly as specified in yarn.lock
without modifications during CI runs.

Author: devin-ai-integration[bot]

.github/workflows/ci.yaml

@@ -28,7 +28,7 @@ jobs:
         run: python -m pip install -U "jupyterlab>=4.0.0,<5"
 
       - name: Install dependencies
-        run: jlpm
+        run: jlpm install --frozen-lockfile
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}