Bump FsCheck from 2.16.5 to 2.16.6

Bumps [FsCheck](https://github.com/fsharp/FsCheck) from 2.16.5 to 2.16.6.
- [Release notes](https://github.com/fsharp/FsCheck/releases)
- [Changelog](https://github.com/fscheck/FsCheck/blob/master/FsCheck%20Release%20Notes.md)
- [Commits](fscheck/FsCheck@2.16.5...2.16.6)

---
updated-dependencies:
- dependency-name: FsCheck
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

tests/ExcelFinancialFunctions.Tests/ExcelFinancialFunctions.Tests.fsproj

@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FsCheck" Version="2.16.5" />
+    <PackageReference Include="FsCheck" Version="2.16.6" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />