chore(deps): update microsoft.build to 18.4.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.Build (source)	nuget	minor	18.3.3 → 18.4.0
Microsoft.Build.Framework (source)	nuget	minor	18.3.3 → 18.4.0
Microsoft.Build.Utilities.Core (source)	nuget	minor	18.3.3 → 18.4.0

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This PR has been generated by Renovate Bot.

[claude]

Code Review: chore(deps): update microsoft.build to 18.4.0

Summary: Routine dependency update from Renovate Bot bumping three Microsoft.Build packages from 18.3.3 → 18.4.0 (minor version bump).

Changes Reviewed

1. Directory.Packages.props — Central package version for Microsoft.Build.Utilities.Core bumped to 18.4.0.
2. TUnit.SourceGenerator.Benchmarks/TUnit.SourceGenerator.Benchmarks.csproj — Version overrides for Microsoft.Build and Microsoft.Build.Framework bumped to 18.4.0.

Assessment

This is a straightforward, low-risk minor version bump. The changes are:

• Consistent across all three related packages (all updated to the same version 18.4.0).
• Correctly using VersionOverride in the benchmarks project where explicit pinning is needed (the ExcludeAssets="runtime" PrivateAssets="all" pattern is appropriate for MSBuild packages used as build-time tools).
• The central package management approach in Directory.Packages.props is correctly updated for Microsoft.Build.Utilities.Core, while the benchmarks project correctly uses VersionOverride for its direct MSBuild references.

No architectural, design, or correctness concerns. The update looks good to merge. ✓