Upgrade CI to use .NET 8 #1463

Job	Run time
calc-version	13s
CodeQL-Analyze	5m 42s
analyze	5m 48s
integration-test (AcrApi, ef)	2m 45s
integration-test (AcrApi, mongodb)	2m 41s
integration-test (DicomDimseScp, ef)	3m 42s
unit-test	3m 10s
integration-test (DicomDimseScp, mongodb)	3m 44s
integration-test (DicomDimseScu, ef)	2m 37s
integration-test (DicomDimseScu, mongodb)	2m 56s
integration-test (DicomWebExport, ef)	2m 38s
integration-test (DicomWebExport, mongodb)	2m 36s
integration-test (DicomWebStow, ef)	4m 45s
integration-test (DicomWebStow, mongodb)	4m 31s
integration-test (HealthLevel7, ef)	3m 11s
integration-test (HealthLevel7, mongodb)	3m 22s
integration-test (Fhir, ef)	3m 0s
integration-test (Fhir, mongodb)	2m 57s
integration-test (RemoteAppExecutionPlugIn, ef)	2m 12s
integration-test (RemoteAppExecutionPlugIn, mongodb)	2m 11s
docs	3m 40s
build (ubuntu-latest)	2m 31s
build (windows-latest)	2m 40s
Publish to GitHub Packages	0s
release	0s
	1h 13m 32s

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