Error: Unable to resolve class CliBuilder

[khltrifork]

I've been using this package of scripts for years, always worked perfectly.
But today, this error started popping up

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/Users/xyz/Documents/Tools/devtools.groovy: 23: unable to resolve class CliBuilder
 @ line 23, column 11.
   def cli = new CliBuilder(usage:'devtools.groovy command option')
             ^

1 error

I suspect that it came from updating groovy to 4.0.0
I can see that Homebrew updated it a few days ago.

Is there any workaround/fix for this? I would hate to see these awesome scripts to die out