dependabot: bump FluentAssertions from 6.2.0 to 6.12.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.2.0 to 6.12.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.2.0...6.12.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

tests/NXPorts.Tests/NXPorts.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net48</TargetFrameworks>
   </PropertyGroup>
@@ -11,7 +11,7 @@
     <PackageReference Include="PeNet" Version="1.6.1" />
     <PackageReference Include="MSBuild.ProjectCreation" Version="6.3.0" />
     <PackageReference Include="Buildalyzer" Version="3.2.3" />
-    <PackageReference Include="FluentAssertions" Version="6.2.0" />
+    <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="MSTest.TestAdapter;MSTest.TestFramework" Version="2.2.6" />
   </ItemGroup>