misc: Run pre-commit run --all-files

This is reflect the updates made to black when running `pre-commit
autoupdate`.

Change-Id: Ifb7fea117f354c7f02f26926a5afdf7d67bc5919

src/cpu/testers/traffic_gen/BaseTrafficGen.py

@@ -37,6 +37,7 @@ from m5.params import *
 from m5.proxy import *
 from m5.objects.ClockedObject import ClockedObject
 
+
 # Types of Stream Generators.
 # Those are orthogonal to the other generators in the TrafficGen
 # and are meant to initialize the stream and substream IDs for

src/cpu/testers/traffic_gen/TrafficGen.py

@@ -36,6 +36,7 @@
 from m5.params import *
 from m5.objects.BaseTrafficGen import *
 
+
 # The behaviour of this traffic generator is specified in a
 # configuration file, and this file describes a state transition graph
 # where each state is a specific generator behaviour. Examples include