Update autest to version 1.8.0. (apache#6981)

This updated autest version contains a fix for cleanup logic so that the
port selection mechanism in ports.py works better. Without this update,
the port recycling logic never gets called and we run out of the
optimally selected ports and fallback to the old port selection logic
which has a race condition with another server grabbing the lock before
the test process does, resulting in an address in use error.

Co-authored-by: bneradt <bneradt@verizonmedia.com>

Author: bneradt

tests/Pipfile

@@ -24,7 +24,7 @@ autopep8 = "*"
 pyflakes = "*"
 
 [packages]
-autest = "==1.7.4"
+autest = "==1.8.0"
 traffic-replay = "*" # this should install TRLib, MicroServer, MicroDNS, Traffic-Replay
 hyper = "*"
 dnslib = "*"