Bump xunit from 2.9.0 to 2.9.1 in /SteamKit2 #1018

Job	Run time
Create NetHookAnalyzer2 Release	1m 52s
SteamKit2 on windows-latest - Debug (SDK 8.0.x)	3m 20s
NetHook2 - Win32 - Debug	2m 52s
Create NuGet Package	1m 42s
SteamKit2 on windows-latest - Release (SDK 8.0.x)	2m 5s
NetHook2 - x64 - Debug	1m 27s
Publish to GitHub Packages	0s
SteamKit2 on macos-latest - Debug (SDK 8.0.x)	1m 21s
NetHook2 - Win32 - Release	3m 31s
NetHook2 - x64 - Release	2m 39s
SteamKit2 on macos-latest - Release (SDK 8.0.x)	49s
SteamKit2 on macos-14 - Debug (SDK 8.0.x)	1m 27s
SteamKit2 on macos-14 - Release (SDK 8.0.x)	51s
SteamKit2 on ubuntu-latest - Debug (SDK 8.0.x)	1m 42s
SteamKit2 on ubuntu-latest - Release (SDK 8.0.x)	1m 1s
	26m 39s

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