Allow localhost sockets during dist testing

This PR adds the --allow-unix-socket to the dist CI jobs so that asyncio works with 'self-sockets' (required by the latest release of freezegun).

EDIT: for obvious reasons this solution doesn't work on Windows, so now...

This PR adds --allow-hosts=127.0.0.1 to the dist CI jobs so that asyncio works with 'self-sockets' (required by the latest release of freezegun).