Bump TUnit from 1.18.37 to 1.19.16 (#906)

Updated [TUnit](https://github.com/thomhurst/TUnit) from 1.18.37 to
1.19.16.

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

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

## 1.19.16

<!-- Release notes generated using configuration in .github/release.yml
at v1.19.16 -->

## What's Changed
### Other Changes
* Truncate exceptions in GitHub summary tables by @​thomhurst in
thomhurst/TUnit#5108
### Dependencies
* chore(deps): update tunit to 1.19.11 by @​thomhurst in
thomhurst/TUnit#5106
* chore(deps): bump dompurify from 3.3.0 to 3.3.2 in /docs by
@​dependabot[bot] in thomhurst/TUnit#5096
* chore(deps): bump svgo from 3.2.0 to 3.3.3 in /docs by
@​dependabot[bot] in thomhurst/TUnit#5086


**Full Changelog**:
thomhurst/TUnit@v1.19.11...v1.19.16

## 1.19.11

<!-- Release notes generated using configuration in .github/release.yml
at v1.19.11 -->

## What's Changed
### Other Changes
* Fix HTML report sort to also reorder groups by @​thomhurst in
thomhurst/TUnit#5103
* fix: correct expand-all icon SVG in HTML report by @​slang25 in
thomhurst/TUnit#5105
* Avoid some redundant list allocations by @​SimonCropp in
thomhurst/TUnit#4963
* avoid some redundant enumerable alloc by @​SimonCropp in
thomhurst/TUnit#4972
* use char instead of string for joins by @​SimonCropp in
thomhurst/TUnit#4989
### Dependencies
* chore(deps): update dependency nunit to 4.5.1 by @​thomhurst in
thomhurst/TUnit#5097
* chore(deps): update tunit to 1.19.0 by @​thomhurst in
thomhurst/TUnit#5099
* chore(deps): update dependency humanizer to 3.0.10 by @​thomhurst in
thomhurst/TUnit#5101
* chore(deps): update dependency nunit.analyzers to 4.12.0 by
@​thomhurst in thomhurst/TUnit#5102


**Full Changelog**:
thomhurst/TUnit@v1.19.0...v1.19.11

## 1.19.0

<!-- Release notes generated using configuration in .github/release.yml
at v1.19.0 -->

## What's Changed
### Other Changes
* fix: improve CreateTestVariant API and fix void/ValueTask return types
by @​thomhurst in thomhurst/TUnit#5095
### Dependencies
* chore(deps): update tunit to 1.18.37 by @​thomhurst in
thomhurst/TUnit#5094


**Full Changelog**:
thomhurst/TUnit@v1.18.37...v1.19.0

Commits viewable in [compare
view](thomhurst/TUnit@v1.18.37...v1.19.16).
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Directory.Packages.props

@@ -24,7 +24,7 @@
     <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="1.18.37" />
+    <PackageVersion Include="TUnit" Version="1.19.16" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
     <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
     <PackageVersion Include="IntelliTect.Multitool" Version="2.0.0" />