fix docker build error on Cloud Run

[ElishaKay]

There's an error when trying to deploy to cloud run:

Step 9/13 : RUN uv sync --frozen
 ---> Running in 45f309245317
error: Querying Python at `/app/.venv/bin/python3` failed with exit status exit status: 127

[stderr]
/app/.venv/bin/python3: error while loading shared libraries: libexpat.so.1: cannot open shared object file: No such file or directory
The command '/bin/sh -c uv sync --frozen' returned a non-zero code: 2
ERROR
ERROR: build step 0 "gcr.io/cloud-builders/docker" failed: step exited with non-zero status: 2

The changes in this branch successfully deploy the data science project to Cloud Run.

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