Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/31e7941..6cf20f1

Suppress GoogleTest warnings on windows (MSVC) too. (#1320) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/6cf20f1

Add docs on Memory profiling (#1217). (#1319) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/5531ec8

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

Change-Id: I4ba1571dc6b955a3ba1ad1569300518a709dd8e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3387111
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@{#78616}

DEPS

@@ -223,7 +223,7 @@ deps = {
     'condition': 'checkout_fuchsia',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '31e7941796b55fdc3c9cc649a0b8d1c55ca7b446',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '6cf20f1e0219078371161af83319d10f72f0832e',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + '6b74da4757a549563d7c37c8fae3e704662a043b',