chore(deps): update dependency fluentassertions to v7 (#325)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [FluentAssertions](https://www.fluentassertions.com/)
([source](https://redirect.github.com/fluentassertions/fluentassertions))
| `6.12.2` -> `7.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/FluentAssertions/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/FluentAssertions/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/FluentAssertions/6.12.2/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/FluentAssertions/6.12.2/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v7.0.0`](https://redirect.github.com/fluentassertions/fluentassertions/releases/tag/7.0.0)

[Compare
Source](https://redirect.github.com/fluentassertions/fluentassertions/compare/6.12.2...7.0.0)

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

#### What's Changed

##### Breaking Changes

- Drop support for .NET Core 2.1, 3.0 and NSpec by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2835](https://redirect.github.com/fluentassertions/fluentassertions/pull/2835)

##### Fixes

- The expectation node identified as a cyclic reference is still
compared to the subject node using simple equality. by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2819](https://redirect.github.com/fluentassertions/fluentassertions/pull/2819)
- Fix support for write-only properties in BeEquivalentTo by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2836](https://redirect.github.com/fluentassertions/fluentassertions/pull/2836)

##### Documentation

- Fix minor syntax error in objectgraphs.md by
[@&#8203;rklec](https://redirect.github.com/rklec) in
[https://github.com/fluentassertions/fluentassertions/pull/2847](https://redirect.github.com/fluentassertions/fluentassertions/pull/2847)

##### Others

- Use the same Qodana build pipeline as develop is using by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2809](https://redirect.github.com/fluentassertions/fluentassertions/pull/2809)
- Add section highlighting for better navigation by
[@&#8203;sentemon](https://redirect.github.com/sentemon) in
[https://github.com/fluentassertions/fluentassertions/pull/2807](https://redirect.github.com/fluentassertions/fluentassertions/pull/2807)
- Bump all relevant dependencies by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2834](https://redirect.github.com/fluentassertions/fluentassertions/pull/2834)
- Changed references to the master branch to main by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2848](https://redirect.github.com/fluentassertions/fluentassertions/pull/2848)
- Missed two more references to master by
[@&#8203;dennisdoomen](https://redirect.github.com/dennisdoomen) in
[https://github.com/fluentassertions/fluentassertions/pull/2849](https://redirect.github.com/fluentassertions/fluentassertions/pull/2849)
- Backport bump of `System.Configuration.ConfigurationManager` and
`System.Threading.Tasks.Extensions` by
[@&#8203;jnyrup](https://redirect.github.com/jnyrup) in
[https://github.com/fluentassertions/fluentassertions/pull/2856](https://redirect.github.com/fluentassertions/fluentassertions/pull/2856)

#### New Contributors

- [@&#8203;sentemon](https://redirect.github.com/sentemon) made their
first contribution in
[https://github.com/fluentassertions/fluentassertions/pull/2807](https://redirect.github.com/fluentassertions/fluentassertions/pull/2807)
- [@&#8203;rklec](https://redirect.github.com/rklec) made their first
contribution in
[https://github.com/fluentassertions/fluentassertions/pull/2847](https://redirect.github.com/fluentassertions/fluentassertions/pull/2847)

**Full Changelog**:
fluentassertions/fluentassertions@6.12.2...7.0.0

</details>

---

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Directory.Packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.2" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.2" />
-    <PackageVersion Include="FluentAssertions" Version="6.12.2" />
+    <PackageVersion Include="FluentAssertions" Version="7.0.0" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.4.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />