Roll gn from 468c6128db7f to c97a86a72105

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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: Ib41119be9c247063cd68fcd31474593140c81555
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/402581
Reviewed-by: Alexander Aprelev <[email protected]>
Reviewed-by: Siva Annamalai <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: DEPS Autoroller

DEPS

@@ -79,7 +79,7 @@ vars = {
   "clang_version": "git_revision:388d7f144880dcd85ff31f06793304405a9f44b6",
 
   # https://chrome-infra-packages.appspot.com/p/gn/gn
-  "gn_version": "git_revision:468c6128db7fabe32a29d4753460ef53594406fc",
+  "gn_version": "git_revision:c97a86a72105f3328a540f5a5ab17d11989ab7dd",
 
   "reclient_version": "git_revision:c7349324c93c6e0d85bc1e00b5d7526771006ea0",
   "download_reclient": True,