Bump Verify.Xunit from 28.12.0 to 28.13.0 in the testing group #832

Job	Run time
build (macos-latest)	44s
lint-markdown	11s
build (ubuntu-latest)	38s
build (windows-latest)	2m 40s
integration (macos-latest, default)	53s
integration (macos-latest, bash)	1m 33s
integration (macos-latest, pwsh)	55s
integration (ubuntu-latest, default)	45s
integration (ubuntu-latest, bash)	49s
integration (ubuntu-latest, pwsh)	57s
integration (windows-latest, default)	2m 52s
integration (windows-latest, pwsh)	3m 7s
integration (windows-latest, C:\Program Files\Git\bin\bash.exe)	3m 16s
release	0s
	19m 20s

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