fastapi and uvicorn are loaded as dependencies but don't seem to be used

the [Dockerfile](https://github.com/aws-samples/deploy-python-flask-microservices-to-aws-using-open-source-tools/blob/main/app/Dockerfile) installs fastapi and uvicorn `RUN pip install --user fastapi uvicorn boto3 flask`, but they don't seem to be used in the project.

Is this an error and can they be removed?

Start with app/Dockerfile and inspect the project for imports or runtime references to fastapi and uvicorn. Verify whether removing them still allows the Flask service image to build and run, then update the dependency install line if they are unused.

索引モデルが issue の本文から書いたものです。