Bump AutoFixture.Xunit2 from 4.17.0 to 4.18.1 (#2076)

Bumps [AutoFixture.Xunit2](https://github.com/AutoFixture/AutoFixture) from 4.17.0 to 4.18.1.
- [Release notes](https://github.com/AutoFixture/AutoFixture/releases)
- [Commits](AutoFixture/AutoFixture@v4.17.0...v4.18.1)

---
updated-dependencies:
- dependency-name: AutoFixture.Xunit2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/Directory.Build.props

@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="AutoFixture.Xunit2" Version="4.17.0"/>
+        <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1"/>
         <PackageReference Include="FluentAssertions" Version="6.11.0"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0"/>
         <PackageReference Include="xunit" Version="2.4.2"/>