Update google_benchmark

Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/7280499..ac8a6d3

cleanup comments (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/ac8a6d3

fix sanitizer builds by using clang 13 (#1426) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/8205547

fix dependabot numpy version warning (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/0a95a42

fix cmake warning for libcxx setup (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/a8bc318

Expose default help printer function (#1425) (Yuri Khan)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/4136c4a

Fix DoNotOptimize() GCC compile error with some types (#1340) (#1424) (Alexander Popov)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/dfdda57

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

Change-Id: I3e08e9e4f0374c836b9fb96d80feff125664589f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3750518
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81585}

DEPS

@@ -235,7 +235,7 @@ deps = {
     'dep_type': 'cipd',
   },
   'third_party/google_benchmark/src': {
-    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + '7280499e8ed6f0a67268fa0e97ca3a7a72e1cb0c',
+    'url': Var('chromium_url') + '/external/github.com/google/benchmark.git' + '@' + 'ac8a6d3de91d7deca24d1505ec3b551d0d56bad4',
   },
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + 'af29db7ec28d6df1c7f0f745186884091e602e07',