Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/108ca84..920fa14

fix some build warnings on type conversions (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/920fa14

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: Ib4b588f343dca80474e2c7b7e3ed3f59a826324e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3695963
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#81018}