All Windows and Mac tests seem to be failing because of an error during the execution of the set-temp-creds shell script.

It looks like boto3 is being installed, but the script is having trouble importing it. The issue might be that the PYTHON environment variable needs to be set to the same python where boto3 is installed.

Additionally, we're installing libmongocrypt from an outdated URL in Windows tasks. The URL should be updated to install v1.2.0, which supports authenticating with temporary credentials.