Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/bfc3ca5..1cb6993

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/ab5ac1c..f513a0b

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I744a353ec4c80ccee5b63df024002bc0e77aabc7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2448646Reviewed-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@{#70298}

DEPS

@@ -82,7 +82,7 @@ vars = {
 
 deps = {
   'build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'bfc3ca527c0667786cf94c7d6875ae5be7a323fd',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '1cb6993e286e4c65bf19da16adb8a39584d6d598',
   'third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '1407cfd9e5f4de4cf9bd04ecc435ee5b760675c1',
   'third_party/icu':
@@ -250,7 +250,7 @@ deps = {
       'dep_type': 'cipd',
   },
   'tools/clang':
-    Var('chromium_url') + '/chromium/src/tools/clang.git' + '@' + 'ab5ac1c92fe69662ac6bf056dfcfda59d39affb6',
+    Var('chromium_url') + '/chromium/src/tools/clang.git' + '@' + 'f513a0bef645e51aa34690f665a9d4d396142f5b',
   'tools/luci-go': {
       'packages': [
         {