test: refactor min() in test-hash-seed

Replace min() function with Math.min(...).

PR-URL: https://github.com/nodejs/node/pull/25522


Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>