test: delete test/parallel/test-regress-GH-4948

PR-URL: https://github.com/nodejs/node/pull/19279
Refs: https://github.com/nodejs/node/pull/19275#discussion_r173647620


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>