Build(deps): Bump FluentAssertions from 8.0.1 to 8.1.1

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 8.0.1 to 8.1.1.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/main/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@8.0.1...8.1.1)

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

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

Author: dependabot[bot]

Directory.Packages.props

@@ -29,7 +29,7 @@
     <PackageVersion Include="prometheus-net.AspNetCore" Version="8.2.1" />
     <PackageVersion Include="Serilog.AspNetCore" Version="9.0.0" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="7.2.0" />
-    <PackageVersion Include="FluentAssertions" Version="8.0.1" />
+    <PackageVersion Include="FluentAssertions" Version="8.1.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />