Update FSharp.Core

Author: nojaf

Directory.Packages.props

@@ -6,7 +6,7 @@
   </PropertyGroup>
   <ItemGroup>
     <!-- locking the version of F# Core as FCS does this anyway and in practise all will be using the same version -->
-    <PackageVersion Include="FSharp.Core" Version="[7.0.400]" />
+    <PackageVersion Include="FSharp.Core" Version="[8.0.100]" />
     <PackageVersion Include="FSharp.Compiler.Service" Version="[43.8.100]" />
     <PackageVersion Include="CommandLineParser" Version="2.9.1" />
     <PackageVersion Include="Microsoft.Build" Version="" PrivateAssets="all" />