Roll gn from 5d76868385b8 to a2e2717ea670

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/gn-dart-sdk
Please CC dart-ecosystem-gardener@grotations.appspotmail.com,dart-engprod@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in gn: https://bugs.chromium.org/p/gn/issues/list
To file a bug in Dart SDK: https://github.com/dart-lang/sdk/issues

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.dart.try:dart-sdk-linux-try;luci.dart.try:dart-sdk-mac-try;luci.dart.try:dart-sdk-mac-arm64-try;luci.dart.try:dart-sdk-win-try
Change-Id: Ie6a28343a1844249a71604c9e707eaf075a0194f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/349923
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
diff --git a/DEPS b/DEPS
index 8a97dbe..f8d5d99 100644
--- a/DEPS
+++ b/DEPS
@@ -78,7 +78,7 @@
   "clang_version": "git_revision:c58bc24fcf678c55b0bf522be89eff070507a005",
 
   # https://chrome-infra-packages.appspot.com/p/gn/gn
-  "gn_version": "git_revision:5d76868385b81d6c4fb3256240a2ce449c37b5ee",
+  "gn_version": "git_revision:a2e2717ea670249a34b0de4b3e54f268d320bdfa",
 
   "reclient_version": "git_revision:f3883c2237b0eb9cc9524cb571b5ab8378f257e4",