Bump Expecto and FSharp.Core in /Tests

Bumps [Expecto](https://github.com/haf/expecto) and [FSharp.Core](https://github.com/dotnet/fsharp). These dependencies needed to be updated together.

Updates `Expecto` from 10.1.0 to 10.2.1
- [Release notes](https://github.com/haf/expecto/releases)
- [Changelog](https://github.com/haf/expecto/blob/main/RELEASE_NOTES.md)
- [Commits](haf/expecto@10.1.0...10.2.1)

Updates `FSharp.Core` from 6.0.7 to 7.0.200
- [Release notes](https://github.com/dotnet/fsharp/releases)
- [Changelog](https://github.com/dotnet/fsharp/blob/main/release-notes.md)
- [Commits](https://github.com/dotnet/fsharp/commits)

---
updated-dependencies:
- dependency-name: Expecto
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: FSharp.Core
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Tests/Tests.fsproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Fable.Core" Version="4.3.0" />
     <PackageReference Include="Fable.Mocha" Version="2.17.0" />
-    <PackageReference Include="Expecto" Version="10.1.0" />
+    <PackageReference Include="Expecto" Version="10.2.1" />
     <ProjectReference Include="../Src//Dicts.fsproj" />
     <Compile Include="Tests.fs" />
     <Compile Include="RunTests.fs" />