Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/c6c14d2..03a089b

TBR=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com

Change-Id: I2e17cd400ac5a22a977d78d29e35e223488c41c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3142000Reviewed-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/main@{#76683}

DEPS

@@ -92,7 +92,7 @@ deps = {
   'base/trace_event/common':
     Var('chromium_url') + '/chromium/src/base/trace_event/common.git' + '@' + '3da1e2fcf66acd5c7194497b4285ac163f32e239',
   'build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'c6c14d23f503e83d5a60454acd98935ebf282438',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '03a089b7ac4eb8f764d26d8edda7f766688c6f6c',
   'buildtools':
     Var('chromium_url') + '/chromium/src/buildtools.git' + '@' + '7ea3a871db68ae2cbbeaf5433a3192a799ef3c11',
   'buildtools/clang_format/script':