Bump xunit from 2.5.0 to 2.5.1 #7247

Job	Run time
build / build (windows-2022, /c/ProgramData/OpenTelemetry .NET AutoInstrumentation/logs)	19m 51s
build / build (ubuntu-20.04, /var/log/opentelemetry/dotnet)	8m 4s
build / build (macos-11, /var/log/opentelemetry/dotnet)	8m 56s
build-container / build-container (alpine, linux-musl)	6m 10s
build-container / build-container (centos, linux-glibc)	6m 39s
test-build-container (alpine, alpine, linux-musl)	12m 27s
test-build-container (centos, centos, linux-glibc)	13m 55s
test-build-container (debian, centos, linux-glibc)	10m 59s
test-build-native (windows-2022)	5m 52s
test-build-managed (net7.0, windows-2022)	16m 28s
test-build-windows-container-tests (windows-2022, windows-only)	22m 3s
test-build-managed (net7.0, ubuntu-20.04)	10m 59s
test-build-managed (net7.0, macos-11)	14m 34s
test-build-managed (net6.0, windows-2022)	17m 19s
test-build-managed (net6.0, ubuntu-20.04)	13m 30s
test-build-managed (net6.0, macos-11)	13m 13s
test-build-managed (net462, windows-2022)	16m 25s
build-nuget-packages / build-nuget-packages	5m 48s
test-nuget-packages (ubuntu-20.04)	3m 12s
test-nuget-packages (macos-11)	6m 22s
test-nuget-packages (windows-2022)	5m 15s
	3h 58m 1s

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