Bump TUnit from 1.21.24 to 1.21.30 (#955)

Updated [TUnit](https://github.com/thomhurst/TUnit) from 1.21.24 to
1.21.30.

<details>
<summary>Release notes</summary>

_Sourced from [TUnit's
releases](https://github.com/thomhurst/TUnit/releases)._

## 1.21.30

<!-- Release notes generated using configuration in .github/release.yml
at v1.21.30 -->

## What's Changed
### Other Changes
* feat: add test discovery Activity span for tracing by @​thomhurst in
thomhurst/TUnit#5246
* Fix mock generator not preserving nullable annotations on reference
types by @​Copilot in thomhurst/TUnit#5251
* Fix ITestSkippedEventReceiver not firing for [Skip]-attributed tests
by @​thomhurst in thomhurst/TUnit#5253
* Use CallerArgumentExpression for TestDataRow by default. by @​m-gasser
in thomhurst/TUnit#5135
### Dependencies
* chore(deps): update tunit to 1.21.24 by @​thomhurst in
thomhurst/TUnit#5247


**Full Changelog**:
thomhurst/TUnit@v1.21.24...v1.21.30

Commits viewable in [compare
view](thomhurst/TUnit@v1.21.24...v1.21.30).
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Directory.Packages.props

@@ -24,7 +24,7 @@
     <PackageVersion Include="Azure.Identity" Version="1.19.0" />
     <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.4.0" />
     <PackageVersion Include="Microsoft.ApplicationInsights.Profiler.AspNetCore" Version="3.0.1" />
-    <PackageVersion Include="TUnit" Version="1.21.24" />
+    <PackageVersion Include="TUnit" Version="1.21.30" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
     <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
     <PackageVersion Include="IntelliTect.Multitool" Version="2.0.0" />