Bump xunit from 2.5.0 to 2.6.3 #1457

Job	Run time
analyze	5m 13s
calc-version	25s
CodeQL-Analyze	4m 53s
integration-test (AcrApi, ef)	2m 26s
integration-test (AcrApi, mongodb)	2m 33s
integration-test (DicomDimseScp, ef)	3m 43s
unit-test	5m 8s
integration-test (DicomDimseScp, mongodb)	3m 15s
integration-test (DicomDimseScu, ef)	2m 28s
integration-test (DicomDimseScu, mongodb)	2m 28s
integration-test (DicomWebExport, ef)	2m 10s
integration-test (DicomWebExport, mongodb)	2m 20s
integration-test (DicomWebStow, ef)	4m 17s
integration-test (DicomWebStow, mongodb)	4m 27s
integration-test (HealthLevel7, ef)	3m 19s
integration-test (HealthLevel7, mongodb)	3m 24s
integration-test (Fhir, ef)	2m 51s
integration-test (Fhir, mongodb)	2m 40s
integration-test (RemoteAppExecutionPlugIn, ef)	1m 51s
integration-test (RemoteAppExecutionPlugIn, mongodb)	1m 56s
docs	4m 17s
build (ubuntu-latest)	3m 34s
build (windows-latest)	4m 33s
Publish to GitHub Packages	19s
release	0s
	1h 14m 30s

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