Bump scalafix version and use os.pathsep (#6938)
Bump scalafix version and use os.pathsep (#6938)

### Problem

--tool-classpath from #6926 isn't supported in the default scalafix version, and ':' was hardcoded as path separator. This meant it would break on windows, and this option wouldn't work on default pants install.

### Solution

Bump the scalafix version, and use os.pathsep.

### Result

Things will work out of the box.
tdyas/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,wisechengyi/pants,jsirois/pants,tdyas/pants,benjyw/pants,twitter/pants,tdyas/pants,benjyw/pants,tdyas/pants,twitter/pants,benjyw/pants,pantsbuild/pants,tdyas/pants,twitter/pants,pantsbuild/pants,tdyas/pants,wisechengyi/pants,pantsbuild/pants,twitter/pants,jsirois/pants,wisechengyi/pants,twitter/pants,benjyw/pants,wisechengyi/pants,tdyas/pants,tdyas/pants,tdyas/pants,wisechengyi/pants,wisechengyi/pants,twitter/pants,wisechengyi/pants,jsirois/pants,twitter/pants,wisechengyi/pants,benjyw/pants,pantsbuild/pants,twitter/pants,pantsbuild/pants,wisechengyi/pants,pantsbuild/pants,twitter/pants