Bump Spectre.Console.Testing from 0.51.1 to 0.54.0 (#19076)

Updated
[Spectre.Console.Testing](https://github.com/spectreconsole/spectre.console)
from 0.51.1 to 0.54.0.

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

_Sourced from [Spectre.Console.Testing's
releases](https://github.com/spectreconsole/spectre.console/releases)._

## 0.54.0

Version `0.54.0` of Spectre.Console has been released!

## Spectre.Console.Cli has a new home!

We've decided to move `Spectre.Console.Cli` to its own repository, where
we will prepare it for a _1.0_ release. This means that the
_Spectre.Console.Cli_ NuGet packages will no longer be versioned
together with _Spectre.Console_. They will now have a preview version
such as `1.0.0-alpha-0.x`.

There should be no issues staying on version _0.53.0_ of
_Spectre.Console.Cli_ until we release a stable version if you prefer
not to use a pre-release dependency.

## New unit testing package for Spectre.Console.Cli

There is now a new testing package for _Spectre.Console.Cli_ called
[Spectre.Console.Cli.Testing](https://www.nuget.org/packages/Spectre.Console.Cli.Testing).
This is where you will find the `CommandAppTester` from now on.

You can find more information about unit testing in the
[documentation](https://spectreconsole.net/cli/unit-testing).

## What's Changed

* Normalizes paths when writing exceptions to the console for tests. by
[@​phil-scott-78](https://github.com/phil-scott-78) in
[#​1758](spectreconsole/spectre.console#1758)
* Fixes issue with Panel not applying overflow to children by
[@​phil-scott-78](https://github.com/phil-scott-78) in
[#​1942](spectreconsole/spectre.console#1942)
* Remove Spectre.Console.Cli from repository by
[@​patriksvensson](https://github.com/patriksvensson) in
[#​1928](spectreconsole/spectre.console#1928)

**Full Changelog**:
spectreconsole/spectre.console@0.53.0...0.54.0

## 0.53.1

This is a hotfix release for 0.53.0, which accidentally included
`OpenCli.Sources` as a dependency, instead of being included in the
package.

As a bonus, a fix for panels was also included in this release 😄 

## What's Changed
* Ensure OpenCli.Sources are not a dependency of the CLI package. by
@​patriksvensson in d61788d6c681745c8d1158ceeb4545ba37a99522
* Normalizes paths when writing exceptions to the console for tests. by
@​phil-scott-78 in
spectreconsole/spectre.console#1758
* Fixes issue with Panel not applying overflow to children by
@​phil-scott-78 in
spectreconsole/spectre.console#1942

**Full Changelog**:
spectreconsole/spectre.console@0.53.0...0.53.1

## 0.53.0

## What's Changed

* Add top-level CancellationToken support to Spectre.Console.Cli by
[@​0xced](https://github.com/0xced) in
[#​1911](spectreconsole/spectre.console#1911)
* Update the Spectre.Console.Cli documentation with CancellationToken by
[@​0xced](https://github.com/0xced) in
[#​1920](spectreconsole/spectre.console#1920)

**Full Changelog**:
spectreconsole/spectre.console@0.52.0...0.53.0

## 0.52.0

## What's Changed

* Add OpenCLI integration to Spectre.Console.Cli by
[@​patriksvensson](https://github.com/patriksvensson) in
[#​1909](spectreconsole/spectre.console#1909)
* Fix OPENCLI_VISIBILITY_INTERNAL to DefineConstants concat by
[@​devlead](https://github.com/devlead) in
[#​1912](spectreconsole/spectre.console#1912)

**Full Changelog**:
spectreconsole/spectre.console@0.51.1...0.52.0

Commits viewable in [compare
view](spectreconsole/spectre.console@0.51.1...0.54.0).
</details>

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src/Directory.Packages.props

@@ -93,7 +93,7 @@
     <PackageVersion Include="Serilog.Sinks.TextWriter" Version="3.0.0" />
     <PackageVersion Include="SharpYaml" Version="2.1.4" />
     <PackageVersion Include="Spectre.Console" Version="0.54.0" />
-    <PackageVersion Include="Spectre.Console.Testing" Version="0.51.1" />
+    <PackageVersion Include="Spectre.Console.Testing" Version="0.54.0" />
     <PackageVersion Include="StreamJsonRpc" Version="2.20.20" />
     <PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     <PackageVersion Include="System.CommandLine.Hosting" Version="0.4.0-alpha.22272.1" />