Update V8 to version 9.7.27.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/cd086cb1..6fb21dbe

Please follow these instructions for assigning/CC'ing issues:
https://v8.dev/docs/triage-issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux-blink-rel
CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_optional_gpu_tests_rel
CQ_INCLUDE_TRYBOTS=luci.chromium.try:mac_optional_gpu_tests_rel
CQ_INCLUDE_TRYBOTS=luci.chromium.try:win_optional_gpu_tests_rel
CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel

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Change-Id: I9cc4a838f7209b7e03cce85231ef98b952ba8dac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3223383
Bot-Commit: 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@{#931721}
diff --git a/DEPS b/DEPS
index c745781..1f7fb85a 100644
--- a/DEPS
+++ b/DEPS
@@ -239,7 +239,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': 'cd086cb19dca0d1508a7e53cb345ec441cda7480',
+  'v8_revision': '6fb21dbeff453687778d4719ed9b4804e82e94d9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.