Bump FluentAssertions from 6.12.0 to 7.0.0-alpha.3

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.12.0 to 7.0.0-alpha.3.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.0...7.0.0-alpha.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

tests/VerticalSliceArchitecture.ArchTests/VerticalSliceArchitecture.ArchTests.csproj

@@ -10,7 +10,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="6.12.0" />
+        <PackageReference Include="FluentAssertions" Version="7.0.0-alpha.3" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0"/>
         <PackageReference Include="NetArchTest.Rules" Version="1.3.2" />
         <PackageReference Include="xunit" Version="2.4.2"/>