Upgrade to slowapi==0.1.8

[ewdurbin]

Is your feature request related to a specific problem?

Yes, I'm unable to run fides when binding to a Unix Domain Socket (UDS) rather than a TCP socket.

SlowAPI 0.1.8 introduced a fix in laurentS/slowapi@9938792 that handles the case where request.client is None as with a UDS.

Describe the solution you'd like

Upgrade to slowapi==0.1.8

Describe alternatives you've considered, if any

N/A - My deployment infrastructure requires binding to UDS.

Additional context

N/A