chore(deps): bump FluentAssertions from 6.11.0 to 6.12.0 in /src (#277)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.11.0 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@6.11.0...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.build.props

@@ -38,7 +38,7 @@
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
 		<PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
 		<PackageReference Include="Xunit.StaFact" Version="1.1.11" />
-		<PackageReference Include="FluentAssertions" Version="6.11.0" />
+		<PackageReference Include="FluentAssertions" Version="6.12.0" />
 		<PackageReference Include="DiffEngine" Version="12.2.0" />
 		<PackageReference Include="PublicApiGenerator" Version="11.0.0" />
 		<PackageReference Include="coverlet.msbuild" Version="6.0.0">