benchmark: increase lint compliance

Remove two eslint-disable comments by replacing string concatenation
with template literals. These changes are in catch blocks that are not
part of the actual code being benchmarked.

PR-URL: https://github.com/nodejs/node/pull/23305


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>