Update .requirements.txt

[schwentker]

Fix: Remove getpass from requirements.txt

getpass is part of Python's standard library and should not be listed as a pip dependency. This was causing installation failures with 'No matching distribution found for getpass' error.

Problem:
Users following the setup instructions encounter a blocking error when running pip install -r .requirements.txt

Solution:
Remove getpass from requirements.txt since it's available as a standard library import

Testing:

• Confirmed pip install -r .requirements.txt now works successfully
• All required dependencies (box-sdk-gen, python-dotenv, jupyter) install correctly