chore(deps): update dependency fluentassertions to 6.12.1 (#812)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [FluentAssertions](https://www.fluentassertions.com/)
([source](https://redirect.github.com/fluentassertions/fluentassertions))
| `6.12.0` -> `6.12.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/FluentAssertions/6.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/FluentAssertions/6.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/FluentAssertions/6.12.0/6.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/FluentAssertions/6.12.0/6.12.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v6.12.1`](https://redirect.github.com/fluentassertions/fluentassertions/releases/tag/6.12.1)

[Compare
Source](https://redirect.github.com/fluentassertions/fluentassertions/compare/6.12.0...6.12.1)

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

#### What's Changed

##### Improvements

- Improve `BeEmpty()` and `BeNullOrEmpty()` performance for
`IEnumerable<T>`, by materializing only the first item -
[#&#8203;2530](https://redirect.github.com/fluentassertions/fluentassertions/pull/2530)

##### Fixes

- Fixed formatting error when checking nullable `DateTimeOffset` with
`BeWithin(...).Before(...)` -
[#&#8203;2312](https://redirect.github.com/fluentassertions/fluentassertions/pull/2312)
- `BeEquivalentTo` will now find and can map subject properties that are
implemented through an explicitly-implemented interface -
[#&#8203;2152](https://redirect.github.com/fluentassertions/fluentassertions/pull/2152)
- Fixed that the `because` and `becauseArgs` were not passed down the
equivalency tree -
[#&#8203;2318](https://redirect.github.com/fluentassertions/fluentassertions/pull/2318)
- `BeEquivalentTo` can again compare a non-generic `IDictionary` with a
generic one -
[#&#8203;2358](https://redirect.github.com/fluentassertions/fluentassertions/pull/2358)
- Fixed that the `FormattingOptions` were not respected in inner
`AssertionScope` -
[#&#8203;2329](https://redirect.github.com/fluentassertions/fluentassertions/pull/2329)
- Capitalize `true` and `false` in failure messages and make them
formattable to a custom `BooleanFormatter` -
[#&#8203;2390](https://redirect.github.com/fluentassertions/fluentassertions/pull/2390),
[#&#8203;2393](https://redirect.github.com/fluentassertions/fluentassertions/pull/2393)
- Improved the failure message for `NotBeOfType` when wrapped in an
`AssertionScope` and the subject is null -
[#&#8203;2399](https://redirect.github.com/fluentassertions/fluentassertions/pull/2399)
- Improved the failure message for `BeWritable`/`BeReadable` when
wrapped in an `AssertionScope` and the subject is read-only/write-only -
[#&#8203;2399](https://redirect.github.com/fluentassertions/fluentassertions/pull/2399)
- Improved the failure message for `ThrowExactly[Async]` when wrapped in
an `AssertionScope` and no exception is thrown -
[#&#8203;2398](https://redirect.github.com/fluentassertions/fluentassertions/pull/2398)
- Improved the failure message for `[Not]HaveExplicitProperty` when
wrapped in an `AssertionScope` and not implementing the interface -
[#&#8203;2403](https://redirect.github.com/fluentassertions/fluentassertions/pull/2403)
- Improved the failure message for `[Not]HaveExplicitMethod` when
wrapped in an `AssertionScope` and not implementing the interface -
[#&#8203;2403](https://redirect.github.com/fluentassertions/fluentassertions/pull/2403)
- Changed `BeEquivalentTo` to exclude `private protected` members from
the comparison -
[#&#8203;2417](https://redirect.github.com/fluentassertions/fluentassertions/pull/2417)
- Fixed using `BeEquivalentTo` on an empty `ArraySegment` -
[#&#8203;2445](https://redirect.github.com/fluentassertions/fluentassertions/pull/2445),
[#&#8203;2511](https://redirect.github.com/fluentassertions/fluentassertions/pull/2511)
- `BeEquivalentTo` with a custom comparer can now handle null values -
[#&#8203;2489](https://redirect.github.com/fluentassertions/fluentassertions/pull/2489)
- Ensured that nested calls to `AssertionScope(context)` create a
chained context -
[#&#8203;2607](https://redirect.github.com/fluentassertions/fluentassertions/pull/2607)
- One overload of the `AssertionScope` constructor would not create an
actual scope associated with the thread -
[#&#8203;2607](https://redirect.github.com/fluentassertions/fluentassertions/pull/2607)
- Fixed `ThrowWithinAsync` not respecting `OperationCanceledException` -
[#&#8203;2614](https://redirect.github.com/fluentassertions/fluentassertions/pull/2614)
- Fixed using `BeEquivalentTo` with an `IEqualityComparer` targeting
nullable types -
[#&#8203;2648](https://redirect.github.com/fluentassertions/fluentassertions/pull/2648)

**Full Changelog**:
fluentassertions/fluentassertions@6.12.0...6.12.1

</details>

---

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test/Directory.Build.props

@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="6.12.0" />
+        <PackageReference Include="FluentAssertions" Version="6.12.1" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
         <PackageReference Include="xunit" Version="2.9.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">