chore(deps): update dependency nunit to v4 - autoclosed #465

Job	Run time
test (ubuntu-latest, net6.0)	31s
test_windows (net6.0)	3m 23s
check_code_format	34s
check_licenses (net6.0, App)	33s
test (ubuntu-latest, net8.0)	7s
test_windows (net8.0)	3m 16s
check_licenses (net6.0, Tests)	35s
test (macos-latest, net6.0)	37s
test_windows (net472)	3m 26s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	31s
test (macos-latest, net8.0)	31s
check_licenses_net472 (App)	2m 12s
check_licenses (net8.0, App)	44s
check_licenses_net472 (Tests)	3m 22s
check_version_command (net6.0)	26s
check_licenses (net8.0, Tests)	35s
check_version_command_net472	2m 56s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	2m 8s
check_version_command (net8.0)	19s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	20s
	27m 6s

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