Reduce sampling interval to increase test accuracy.
Flakes happen specially when compiling with Sparkplug.

Bug: v8:12054
Change-Id: Ic58bc97d0ad9861259fc8df4b121425b375669e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3245336
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77547}