CI/CD

Bump xunit from 2.6.5 to 2.6.6 in /SteamKit2 #748

Job	Run time
Publish to GitHub Packages	0s
Create NetHookAnalyzer2 Release	2m 9s
SteamKit2 on windows-latest - Debug (SDK 8.0.x)	2m 6s
NetHook2 - Win32 - Debug	2m 46s
SteamKit2 on windows-latest - Release (SDK 8.0.x)	1m 58s
Create NuGet Package	1m 37s
NetHook2 - x64 - Debug	2m 45s
SteamKit2 on macos-latest - Debug (SDK 8.0.x)	1m 32s
NetHook2 - Win32 - Release	2m 56s
SteamKit2 on macos-latest - Release (SDK 8.0.x)	2m 18s
NetHook2 - x64 - Release	3m 1s
SteamKit2 on ubuntu-latest - Debug (SDK 8.0.x)	1m 10s
SteamKit2 on ubuntu-latest - Release (SDK 8.0.x)	56s
	25m 14s

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