exchangelib needs to be updated

[minsis]

exchangelib is grossly out of date. This pack will only install 1.10.0 as the latest version which is from 2017
https://github.com/ecederstrand/exchangelib/releases/tag/v1.10.0

The latest version is now 4.6.0
https://github.com/ecederstrand/exchangelib/releases/tag/v4.6.0

As a preliminary check get_folder_by_name has been deprecated and removed as of 1.11.0
https://github.com/ecederstrand/exchangelib/blob/0f346094e136ce9764c1486a144db0dcee80e414/CHANGELOG.md#1110

[amanda11]

I think this is handled by #16.