Bump FluentAssertions from 5.10.3 to 6.0.0 (#120)

* Bump FluentAssertions from 5.10.3 to 6.0.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.10.3 to 6.0.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/master/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@5.10.3...6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

* Update to langVersion 10.0

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: reegeek <10356780+reegeek@users.noreply.github.com>

Author: dependabot[bot]

Build/Common.props

@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <PropertyGroup Label="Common properties">
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>10.0</LangVersion>
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
   </PropertyGroup>
 
@@ -33,4 +33,4 @@
     <Optimize>true</Optimize>
   </PropertyGroup>
 
-</Project>
+</Project>

src/Directory.Build.props

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
     <ItemGroup Condition="$(MSBuildProjectName.EndsWith('Tests'))">
-    <PackageReference Include="FluentAssertions" Version="5.10.3" />
+    <PackageReference Include="FluentAssertions" Version="6.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">