Update fuchsia_sdk_cipd_prefix to match Chromium.

Update this entry to match the change in https://crrev.com/999568.

Bug: fuchsia:99205
Change-Id: I412b183e1fb0a75ff8f91d9ecc3b97d765730a70
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93379
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
Auto-Submit: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nigi <nigi@chromium.org>
diff --git a/DEPS b/DEPS
index d218270..523eaa7 100644
--- a/DEPS
+++ b/DEPS
@@ -20,7 +20,7 @@
   'checkout_instrumented_libraries': 'checkout_linux and checkout_configuration != "small"',
 
   # By default, download the fuchsia sdk from the public sdk directory.
-  'fuchsia_sdk_cipd_prefix': 'fuchsia/sdk/core/',
+  'fuchsia_sdk_cipd_prefix': 'fuchsia/sdk/gn/',
 
   'chromium_git': 'https://chromium.googlesource.com',
   'pdfium_git': 'https://pdfium.googlesource.com',