Tests on `macos-latest` hangs indefinitely.

[riz0id]

Running the test suite on MacOS hangs indefinitely which was found out when updating CI from macos-10.15 (deprecated) to macos-latest in #149. It is still not clear why this is. Running the test suite on CI was disabled in #149 to unblock PRs. I tried fixing this in #149 and found out:

• The test suite on ubuntu-latest or any linux machine passes with no issues what so ever.
• Adding timeouts to the server and client threads in the test suite does not appear to have any affect on whether the tests (perhaps this is a python issue?).