Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5fafa7f..cd2c8fe

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I841cf4971c83f84dbe02d1ca771f503ca4856f82
Reviewed-on: https://chromium-review.googlesource.com/c/1316621
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#57228}

DEPS

@@ -13,7 +13,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '5fafa7f6185c4429dd5ad1a2b8e3bc2a18ca43f2',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'cd2c8fe7a03c91d41d81461b61ca152f3a983f82',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '7e0b0c498a5c85c2ba2aaf524ac71cc28627e1bb',
   'v8/third_party/icu':