chore(deps): update dependency microsoft.testing.extensions.codecoverage to 18.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Microsoft.Testing.Extensions.CodeCoverage	18.0.6 → 18.9.0
Microsoft.Testing.Extensions.CodeCoverage	18.7.0 → 18.9.0

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[samtrion]

Skipping automated merge: CI is genuinely red, not flaky. The Run Tests job fails with System.TypeLoadException: Could not load type 'Microsoft.Testing.Platform.Extensions.TestHost.IDataConsumer' from assembly 'Microsoft.Testing.Platform, Version=2.3.0.0' when running with Microsoft.Testing.Extensions.CodeCoverage 18.9.0, indicating a version incompatibility with the currently referenced Microsoft.Testing.Platform assembly. This needs an explicit compatibility fix (likely bumping Microsoft.Testing.Platform alongside CodeCoverage) rather than a trivial rebase, so leaving this for manual follow-up.

[renovate]

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