benchmark: updates iterations of benchmark/async_hooks/gc-tracking.js
Fixes: https://github.com/nodejs/node/issues/50571
The original iteration is too small to trigger the async hooks code logic. Most of CPU is spent on JS test file loading.
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|---|---|---|---|---|
| async_hooks/gc-tracking.js | method="trackingEnabled" | 33158974.16 | 27051514.5 | 123% |
| async_hooks/gc-tracking.js | method="trackingEnabledWithDestroyHook" | 2308431.69 | 2173549.22 | 106% |
| async_hooks/gc-tracking.js | method="trackingDisabled" | 214547979.3 | 80271748.77 | 267% |