Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/e7a8415..45b194e

Introduce Coefficient of variation aggregate (#1220) (Roman Lebedev)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/45b194e

Statistics: add support for percentage unit in addition to time (#1219) (Roman Lebedev)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/12dc5ee

report.py: adjust expected u-test values for tests (Roman Lebedev)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/67b77da

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

Change-Id: Ide3df922b882bfc02510f8d763c9a9451d94955b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3142457Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#76663}

DEPS

@@ -232,7 +232,7 @@ deps = {
     'condition': 'checkout_fuchsia',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + 'e7a8415876e96acfcc05cedc0cead1363bd1ae68',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '45b194e4d4101f4de46dc2afaf20254512ceaa96',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + '955c7f837efad184ec63e771c42542d37545eaef',