executeFSIWithArgs fails because it can't find fsi

[ovatsus]

In FSharp.Data, executeFSIWithArgs "docs/tools" "generate.fsx" started failing with System.Exception: Start of process fsi.exe failed. The system cannot find the file specified (fsprojects/FSharp.Data#1142)

This was either due to the upgrade from FAKE 4.64.4 to 4.64.11, or due to the upgrade to the F# SDK 10.1 SDK which has a different path structure

Executing the file inside VS or VSCode works fine though, it only fails when running from the command line with packages\FAKE\tools\FAKE.exe build.fsx (which is done by build.cmd)