gh-gei Bump xunit from 2.5.0 to 2.8.0

Bumps xunit from 2.5.0 to 2.8.0.

Commits

be260b3 v2.8.0
a8ceb66 #783: Add -useansicolor flag to console runner (v2)
7b0ff93 Don't show /aggressive with unlimited threads
46cdf06 Support parallel algorithm in MSBuild runner
b4aa876 Support multipler syntax in MSBuild runner
6790b48 Add aggressive display to TestFrameworkEnvironment reported by XunitTestAssem...
3dd7e91 Update mocks to make CollectionBehaviorAttribute property values optional
4c82dea Asking for default threads should set 0, not null
d73cdef Should not try to use a semaphore when we've been asked for unlimited threads
3722e54 Enable multiplier style max threads support
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