Bump FluentAssertions from 8.2.0 to 8.8.0 (#187)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/BBT.StructureTools.Tests/BBT.StructureTools.Tests.csproj

@@ -32,7 +32,7 @@
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="FluentAssertions" Version="8.2.0">
+    <PackageReference Include="FluentAssertions" Version="8.8.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.2">