DependencyManager Win32Exception on non windows

Description

Didn't found how to add private nuget sources in F# scripts. So tried to install paket as a package manager.
Followed instructions at https://fsprojects.github.io/Paket/fsi-integration.html
But this throws Win32Exception on Macos

Repro steps

1. downloaded the FSharp.DependencyManager.Paket nuget sending the line to F# interactive

#r "nuget: FSharp.DependencyManager.Paket"

2. Copy the manager dll to the folder where current sdk is installed

cp ~/.nuget/packages/fsharp.dependencymanager.paket/6.0.0-beta8/lib/netstandard2.0/FSharp.DependencyManager.Paket.dll \
    /usr/local/share/dotnet/sdk/5.0.103/FSharp/

3. Created a script, referencing a package using paket

#r "paket: nuget FParsec"

open FParsec

4. runned the script

$ dotnet fsi paketdeps.fsx

Expected behavior

Expected it would add a package to the script

Actual behavior

❯ dotnet fsi paketdeps.fsx
:paket> using /Users/username/.nuget/packages/paket/5.257.0/tools/paket.exe
exception while resolving dependencies: System.ComponentModel.Win32Exception (8): Exec format error
   at System.Diagnostics.Process.ForkAndExecProcess(String filename, String[] argv, String[] envp, String cwd, Boolean redirectStdin, Boolean redirectStdout, Boolean redirectStderr, Boolean setCredentials, UInt32 userId, UInt32 groupId, UInt32[] groups, Int32& stdinFd, Int32& stdoutFd, Int32& stderrFd, Boolean usesTerminal, Boolean throwOnNoExec)
   at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at ReferenceLoading.PaketHandler.ResolveDependenciesForLanguage$cont@176(String targetFramework, String scriptDir, IEnumerable`1 prioritizedSearchPaths, String fileType, String workingDir, FileInfo workingDirSpecFile, String rootDir, FSharpList`1 packageManagerTextLines, String loadScript, Unit unitVar)
   at ReferenceLoading.PaketHandler.ResolveDependenciesForLanguage(String fileType, String targetFramework, IEnumerable`1 prioritizedSearchPaths, String scriptDir, String scriptName, IEnumerable`1 packageManagerTextLinesFromScript)
   at ReferenceLoading.PaketHandler.ResolveDependencies(String targetFramework, String scriptDir, String scriptName, IEnumerable`1 packageManagerTextLinesFromScript)
   at Microsoft.FSharp.DependencyManager.Paket.PaketDependencyManagerProvider.ResolveDependencies(String scriptDir, String mainScriptName, String scriptName, IEnumerable`1 packageManagerTextLines, String targetFramework)


/Users/username/Projects/fsharp/paketdeps.fsx(3,6): error FS0039: The namespace or module 'FParsec' is not defined.

Known workarounds

use nuget instead of paket as a package manager

#r "nuget: FParsec"

open FParsec

Additional info

• macos catalina,
• .net sdk. 5.0.103
• paket cli tool - tried both latest stable 5.257.0 and latest prerelease 6.0.0-beta8
  in both cases is shown the usage of 5.257.0 version

Start with the ReferenceLoading.PaketHandler.ResolveDependenciesForLanguage stack-trace entry point and reproduce the failure using the shown F# script on macOS. Compare how the Paket dependency manager invokes paket.exe with the documented non-Windows setup. Done means the Paket reference resolves on macOS without the Win32Exception and FParsec becomes available.