nuget: bump the nunit group with 2 updates #3

Job	Run time
format	3m 22s
pr_build / macOS Universal (Debug)	6m 6s
pr_build / win-x64 (Debug)	2m 50s
pr_build / macOS Universal (Release)	5m 40s
pr_build / linux-x64 (Debug)	1m 29s
pr_build / linux-arm64 (Debug)	1m 18s
pr_build / osx-x64 (Debug)	2m 34s
pr_build / win-x64 (Release)	3m 4s
pr_build / linux-x64 (Release)	1m 20s
pr_build / linux-arm64 (Release)	1m 20s
pr_build / osx-x64 (Release)	2m 3s
	31m 6s

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