Bump FSharp.Core and Fittings

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

Updates `FSharp.Core` from 9.0.100 to 9.0.100
- [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)

Updates `Fittings` from 0.8.8 to 0.9.0
- [Changelog](https://github.com/goswinr/Fittings/blob/main/CHANGELOG.md)
- [Commits](goswinr/Fittings@0.8.8...0.9.0)

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

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

FeshHosting.fsproj

@@ -63,7 +63,7 @@
     <!-- normally don't include FSharp.Core in a library, but Update to latest version is needed for latest FSharp.Compiler.Service-->
 	  <PackageReference Update="FSharp.Core" Version="9.0.100" />
 
-	  <PackageReference Include="Fittings" Version="0.8.8" />
+	  <PackageReference Include="Fittings" Version="0.9.0" />
 	  <PackageReference Include="AvalonLog" Version="0.16.0" />
     <!-- <ProjectReference Include="../AvalonLog/AvalonLog.fsproj" /> -->
   </ItemGroup>

FeshStandalone.fsproj

@@ -55,7 +55,7 @@
     <PackageReference Include="FSharp.Compiler.Service" Version="43.9.100" />
     <PackageReference Update="FSharp.Core" Version="9.0.100"  GeneratePathProperty="true"/>
 
-    <PackageReference Include="Fittings" Version="0.8.8" />
+    <PackageReference Include="Fittings" Version="0.9.0" />
     <PackageReference Include="AvalonLog" Version="0.16.0" />
 
     <!--this reference is needed for tooling only, it might not be installed on host PC. (running the .NET Framework version) see also https://github.com/fsprojects/IfSharp/issues/213 -->