Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/6cf20f1..9e859f5

Refine docs on changing cpufreq governor (#1325) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/9e859f5

Expand documentation for unpacking arbitrary arguments. (#1324) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/00e2211

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

Change-Id: I69f60ec9a6db9db57b1a3376730088a829a0aeb5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3396458
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Cr-Commit-Position: refs/heads/main@{#78661}

DEPS

@@ -223,7 +223,7 @@ deps = {
     'condition': 'checkout_fuchsia',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '6cf20f1e0219078371161af83319d10f72f0832e',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '9e859f5bf55073a2b4c785b97b9cb78cbdaf127e',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + 'c9643a2e45ed0cb18b8409c62994be7c6e66dc1b',