Bump FluentAssertions from 5.10.3 to 8.8.0

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.8.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Packages.props

@@ -36,7 +36,7 @@
     <PackageReference Update="coverlet.msbuild" Version="3.0.3" IncludeAssets="all" PrivateAssets="runtime;build;native;contentfiles;analyzers" />
     <PackageReference Update="FakeItEasy" Version="7.0.2" />
     <PackageReference Update="FakeItEasy.Analyzer.CSharp" Version="6.1.0" />
-    <PackageReference Update="FluentAssertions" Version="5.10.3" />
+    <PackageReference Update="FluentAssertions" Version="8.8.0" />
     <PackageReference Update="FluentAssertions.Analyzers" Version="0.11.4" />
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Update="Rocket.Surgery.Extensions.Testing.FakeItEasy" Version="6.0.1" />