Bump FluentAssertions from 7.0.0 to 8.0.0 in /samples (#2441)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@7.0.0...8.0.0)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Brandon Minnick <13558917+brminnick@users.noreply.github.com>

Author: dependabot[bot]

src/CommunityToolkit.Maui.Analyzers.UnitTests/CommunityToolkit.Maui.Analyzers.UnitTests.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="7.0.0" />
+    <PackageReference Include="FluentAssertions" Version="8.0.0" />
     <PackageReference Include="FluentAssertions.Analyzers" Version="0.34.1" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="1.1.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="1.1.2" />

src/CommunityToolkit.Maui.UnitTests/CommunityToolkit.Maui.UnitTests.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="7.0.0" />
+    <PackageReference Include="FluentAssertions" Version="8.0.0" />
     <PackageReference Include="FluentAssertions.Analyzers" Version="0.34.1" />
     <PackageReference Include="Nito.AsyncEx" Version="5.1.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />