Update gn_version to 6e8dcdebbadf4f8aa75e6a4b6e0bdf89dce1513a

Change-Id: I6ffcee5d585824bb34ca01e196c7eadc171914b5
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/145973
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 7bcbc65..61b9f4f 100644
--- a/DEPS
+++ b/DEPS
@@ -142,7 +142,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling GN CIPD package version
   # and whatever else without interference from each other.
-  'gn_version': 'git_revision:129ce6b9af1a93143acd8f8dea6fb8c6cb65abc9',
+  'gn_version': 'git_revision:6e8dcdebbadf4f8aa75e6a4b6e0bdf89dce1513a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling goldctl CIPD package version
   # and whatever else without interference from each other.