Bump FluentAssertions from 6.12.2 to 8.2.0 in /src (#185)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.12.2 to 8.2.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/main/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.2...8.2.0)

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

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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="3.0.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="FluentAssertions" Version="6.12.2">
+    <PackageReference Include="FluentAssertions" Version="8.2.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.2">