github action failing on Windows when using choosenim
I'm getting the following error on github actions:

```
> Run jiro4989/setup-nim-action@v1
choosenim-init: Downloading choosenim-0.6.0_windows_amd64.zip
Archive:  /tmp/choosenim-0.6.0_windows_amd64.zip
  inflating: /tmp/choosenim/choosenim.exe  
  inflating: /tmp/choosenim/libeay64.dll  
  inflating: /tmp/choosenim/ssleay64.dll  
  inflating: /tmp/choosenim/runme.bat  
Downloading DLLs (openssl, pcre, ...)

[                                                  ] 0.06047% 4kb/s
[##################################################] 100.0% 0kb/s
 Extracting dlls.zip
Downloading Nim 1.2.0 from nim-lang.org

[                                                  ] 0.01945% 4kb/s
[##################################################] 100.0% 0kb/s
 Extracting nim-1.2.0_x64.zip
   Building Nim 1.2.0
  Compiler: Already built
     Tools: Already built
  Installed component 'nim'
  Installed component 'nimble'
  Installed component 'nimgrep'
  Installed component 'nimpretty'
  Installed component 'nimsuggest'
  Installed component 'testament'
      Hint: Use 'choosenim <version/channel> --firstInstall' to add
        ... C:\Users\runneradmin\.nimble\bin to your PATH.
   Switched to Nim 1.2.0
    Prompt: C:\Users\runneradmin\.nimble\bin is not in your PATH environment variable.
        ...             Should it be added permanently? -> [forced yes]
      Note: PATH changes will only take effect in new sessions.
choosenim-init: ChooseNim installed in C:\Users\runneradmin\.nimble\bin
choosenim-init: You must now ensure that the Nimble bin dir is in your PATH.

d:\a\_actions\jiro4989\setup-nim-action\v1\lib\installer.js:81
                    throw err;
                    ^

Error: Command failed: choosenim 1.2.0

    at ChildProcess.exithandler (child_process.js:295:12)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5) {
  killed: false,
  code: 1,
  signal: null,
  cmd: 'choosenim 1.2.0'
}
##[error]Error: Command failed: choosenim 1.2.0
```

I'm not able to test this locally since I don't have a windows machine. The author of the action seems to think it is related to choosenim: https://github.com/jiro4989/setup-nim-action/issues/21

I see a bunch of other recent issues opened but I'm not sure if it covers what the fix should be. I'm cc-ing @jiro4989 so they can update `setup-nim-action` once we figure out what change must be made.