deps(nuget): Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.3.0 #760

Job	Run time
Workflow Lint	31s
Dependency Review	6s
OpenAPI Guardrail / OpenAPI Guardrail	37s
Dependency Security Signals	0s
Demo Director Smoke	0s
Backend Solution Regression	0s
E2E Smoke	0s
Load and Concurrency Harness	-1s
	1m 13s

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