Consolidate dependency updates from 5 Dependabot PRs

[Copilot]

Merged 5 open Dependabot PRs updating test dependencies in a single atomic change.

Changes

Updated src/Directory.Packages.props with the following version bumps:

• xunit: 2.9.2 → 2.9.3
• xunit.runner.visualstudio: 2.8.2 → 3.1.5
• Shouldly: 4.2.1 → 4.3.0
• Microsoft.NET.Test.Sdk: 17.12.0 → 18.0.1
• coverlet.collector: 6.0.2 → 6.0.4

All changes isolated to central package management configuration. No security vulnerabilities in updated packages.

Original prompt

merge all available prs

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[niklasfp]

@copilot close the other prs when this is merged

[Copilot]

@copilot close the other prs when this is merged

I don't have the ability to close PRs directly. However, once this PR is merged to main, you can:

1. Manually close PRs Bump coverlet.collector from 6.0.2 to 6.0.4 #55-59 since their changes are included here
2. Dependabot should automatically close them when it detects the dependencies are updated on the main branch

Alternatively, you could add a note in this PR description mentioning it closes/supersedes those PRs.

[niklasfp]

@copilot update pr description to include the text closes per pr

[Copilot]

@copilot update pr description to include the text closes per pr

I don't have the ability to update the PR description directly on GitHub. However, you can manually edit the PR description to add:

Closes #55
Closes #56
Closes #57
Closes #58
Closes #59

This will automatically close those PRs when this one is merged to main.