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deps: Bump Microsoft.NET.Test.Sdk from 17.11.1 to 18.5.1 #44

Job	Run time
Build C# tools	1m 1s
Validate plugin.json	5s
winui-search.exe provenance	1m 27s
Analyzer .targets in sync	5s
Validate SKILL.md frontmatter	4s
Analyzer DLL provenance	9s
	2m 51s