Add TODO to replace rimraf with fs.rmdir on 12.10

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

Author: kevinoid

test-bin/set-up-test-repos.js

@@ -10,6 +10,7 @@
 
 const fs = require('fs');
 const path = require('path');
+// TODO [engine:node@>=12.10]: Use fs.rmdir({recursive: true})
 const rimraf = require('rimraf');
 const util = require('util');