Update V8 DEPS.

Rolling v8/buildtools/linux64: git_revision:e0358b49272c8b354eda0a595e1d7887343fab27..git_revision:64b3b9401c1c3ed5f3c43c1cac00b91f83597ab8

TBR=v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I9f79e66b832ab46ffbc3b3065613cd8a8e4ce563
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2758912Reviewed-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/master@{#73390}

DEPS

@@ -47,7 +47,7 @@ vars = {
   'checkout_google_benchmark' : False,
 
   # GN CIPD package version.
-  'gn_version': 'git_revision:e0358b49272c8b354eda0a595e1d7887343fab27',
+  'gn_version': 'git_revision:64b3b9401c1c3ed5f3c43c1cac00b91f83597ab8',
 
   # luci-go CIPD package version.
   'luci_go': 'git_revision:fd10124659e991321df2f8a5d3749687b54ceb0a',