Bump xunit from 2.8.0 to 2.9.0 #952

Job	Run time
Linux musl (Q8/Q16/Q16-HDRI, x64)	4m 4s
MacOS (Q8/Q16/Q16-HDRI, arm64)	2m 15s
Linux (Q8/Q16/Q16-HDRI, x64)	4m 23s
Library (Core)	7m 48s
MacOS (Q8/Q16/Q16-HDRI)	3m 19s
Library (SystemDrawing)	7m 52s
Library (SystemWindowsMedia)	7m 50s
Windows (Q8, x86)	10m 16s
Windows (Q8, x64)	9m 1s
Windows (Q8, arm64)	6m 53s
Windows (Q8, Any CPU)	9m 41s
Windows (Q8-OpenMP, x64)	9m 51s
Windows (Q8-OpenMP, arm64)	8m 46s
Windows (Q16, x86)	10m 12s
Windows (Q16, x64)	10m 2s
Windows (Q16, arm64)	5m 57s
Windows (Q16, Any CPU)	8m 36s
Windows (Q16-OpenMP, x64)	8m 9s
Windows (Q16-OpenMP, arm64)	6m 20s
Windows (Q16-HDRI, x86)	10m 29s
Windows (Q16-HDRI, x64)	9m 27s
Windows (Q16-HDRI, arm64)	8m 23s
Windows (Q16-HDRI, Any CPU)	8m 41s
Windows (Q16-HDRI-OpenMP, x64)	7m 14s
Windows (Q16-HDRI-OpenMP, arm64)	6m 58s
	3h 12m 27s

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