Windows incompatibility: signal module only provides signals that are supported on host machine

[schmerl]

The test test_popen fails on windows with:

    def kill(self) -> None:
        """Kills the process via a SIGKILL signal."""
>       self.send_signal(signal.SIGKILL)
E       AttributeError: module 'signal' has no attribute 'SIGKILL'

..\src\dockerblade\popen.py:124: AttributeError

This means popen is relying an Linux SIGKILL which apparently doesn't exist in Windows.