Bump FsUnit from 4.1.0 to 4.2.0

Bumps [FsUnit](https://github.com/fsprojects/FsUnit) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/fsprojects/FsUnit/releases)
- [Changelog](https://github.com/fsprojects/FsUnit/blob/master/RELEASE_NOTES.md)
- [Commits](https://github.com/fsprojects/FsUnit/commits)

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

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

Author: dependabot[bot]

src/FSharp.Tests/FSharp.Tests.fsproj

@@ -38,7 +38,7 @@
         <PackageReference Include="System.ValueTuple" Version="4.5.0" Condition="'$(TargetFramework)' == 'net461'" />
         <PackageReference Include="NUnit" Version="3.13.2" />
         <PackageReference Include="NUnitLite" Version="3.13.2" />
-        <PackageReference Include="FsUnit" Version="4.1.0" />
+        <PackageReference Include="FsUnit" Version="4.2.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
         <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.2">
             <PrivateAssets>all</PrivateAssets>