chore(deps): update dependency fluentassertions to 8.4.0 (#906)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[FluentAssertions](https://xceed.com/products/unit-testing/fluent-assertions/)
([source](https://redirect.github.com/fluentassertions/fluentassertions))
| `8.3.0` -> `8.4.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/FluentAssertions/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/FluentAssertions/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/FluentAssertions/8.3.0/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/FluentAssertions/8.3.0/8.4.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>fluentassertions/fluentassertions (FluentAssertions)</summary>

###
[`v8.4.0`](https://redirect.github.com/fluentassertions/fluentassertions/releases/tag/8.4.0)

[Compare
Source](https://redirect.github.com/fluentassertions/fluentassertions/compare/8.3.0...8.4.0)

<!-- Release notes generated using configuration in .github/release.yml
at main -->

##### What's Changed

##### Improvements

- Allow excluding properties by name anywhere in the graph by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/3062](https://redirect.github.com/fluentassertions/fluentassertions/pull/3062)
- Added Should().Throw(), ThrowAsync() and ThrowWithinAsync() flavors
that don’t require a specific exception type by
[@&#8203;Xceed-DelvaJB](https://redirect.github.com/Xceed-DelvaJB) in
[https://github.com/fluentassertions/fluentassertions/pull/3059](https://redirect.github.com/fluentassertions/fluentassertions/pull/3059)

##### Others

- Bump cspell from 9.0.1 to 9.0.2 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[https://github.com/fluentassertions/fluentassertions/pull/3050](https://redirect.github.com/fluentassertions/fluentassertions/pull/3050)
- Bump JetBrains/qodana-action from 2024.2 to 2025.1 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[https://github.com/fluentassertions/fluentassertions/pull/3044](https://redirect.github.com/fluentassertions/fluentassertions/pull/3044)
- Fix qodana warnings by
[@&#8203;jnyrup](https://redirect.github.com/jnyrup) in
[https://github.com/fluentassertions/fluentassertions/pull/3053](https://redirect.github.com/fluentassertions/fluentassertions/pull/3053)
- Add contributor grant by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/3055](https://redirect.github.com/fluentassertions/fluentassertions/pull/3055)
- Bump cspell from 9.0.2 to 9.1.1 by
[@&#8203;dependabot](https://redirect.github.com/dependabot) in
[https://github.com/fluentassertions/fluentassertions/pull/3058](https://redirect.github.com/fluentassertions/fluentassertions/pull/3058)

##### New Contributors

- [@&#8203;Xceed-DelvaJB](https://redirect.github.com/Xceed-DelvaJB)
made their first contribution in
[https://github.com/fluentassertions/fluentassertions/pull/3059](https://redirect.github.com/fluentassertions/fluentassertions/pull/3059)

**Full Changelog**:
fluentassertions/fluentassertions@8.3.0...8.4.0

</details>

---

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test/Directory.Build.props

@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="8.3.0" />
+        <PackageReference Include="FluentAssertions" Version="8.4.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
         <PackageReference Include="xunit" Version="2.9.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.1">