Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/baf52dc..538dcba

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

Change-Id: I7bed7749675df466b9a229be43d91339a9a32695
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1673601Reviewed-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@{#62325}

DEPS

@@ -57,7 +57,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'baf52dc805501626e8251a7c488acf6bee133339',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '538dcba748c8d5277ee133df114a333dab8ff990',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'dd2737e2b5727d836f2442d9a6d960ad978fed66',
   'v8/third_party/icu':