Bump TUnit from 1.18.0 to 1.18.9 (#890)

Updated [TUnit](https://github.com/thomhurst/TUnit) from 1.18.0 to
1.18.9.

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

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

## 1.18.9

<!-- Release notes generated using configuration in .github/release.yml
at v1.18.9 -->

## What's Changed
### Other Changes
* perf: reduce source-gen JIT overhead via metadata factory helpers by
@​thomhurst in thomhurst/TUnit#5056
* perf: add ParameterMetadataFactory and lazy ReflectionInfo resolution
by @​thomhurst in thomhurst/TUnit#5057
* feat: distributed trace collection for HTML report by @​thomhurst in
thomhurst/TUnit#5059
### Dependencies
* chore(deps): update tunit to 1.18.0 by @​thomhurst in
thomhurst/TUnit#5052
* chore(deps): update docker/setup-docker-action action to v5 by
@​thomhurst in thomhurst/TUnit#5058


**Full Changelog**:
thomhurst/TUnit@v1.18.0...v1.18.9

Commits viewable in [compare
view](thomhurst/TUnit@v1.18.0...v1.18.9).
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Directory.Packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="Azure.Identity" Version="1.18.0" />
     <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.4.0" />
     <PackageVersion Include="Microsoft.ApplicationInsights.Profiler.AspNetCore" Version="3.0.1" />
-    <PackageVersion Include="TUnit" Version="1.18.0" />
+    <PackageVersion Include="TUnit" Version="1.18.9" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
     <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
     <PackageVersion Include="IntelliTect.Multitool" Version="2.0.0" />