Bump xunit from 2.8.1 to 2.9.0

[dependabot[bot]]

Bumps xunit from 2.8.1 to 2.9.0.

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Test Results

   35 files     35 suites   20m 14s :stopwatch:   435 tests   435 :white_check_mark: 0 :zzz: 0 :x: 2 944 runs  2 944 :white_check_mark: 0 :zzz: 0 :x:

Results for commit ae351847.

[dependabot[bot]]

Looks like xunit is up-to-date now, so this is no longer needed.