Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/8d86026..bc4639c

Add installation and build instructions for Python bindings (#1392) (Nicholas Junge)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/bc4639c

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

Change-Id: I1ab826ee75b642f04c753dd43e5fe01e9821cc2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3640524
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Cr-Commit-Position: refs/heads/main@{#80461}

DEPS

@@ -235,7 +235,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '8d86026c67e41b1f74e67c1b20cc8f73871bc76e',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + 'bc4639c15443d7bc134de57a39833cf97018f4c1',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + 'af29db7ec28d6df1c7f0f745186884091e602e07',