Roll third_party/icu/ 6a33b647c..899e18383 (4 commits)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/6a33b647c064..899e18383fd7

Created with:
  roll-dep third_party/icu

Change-Id: I02d795b48b2cbcd7a9d7f213820069bb644ba12b
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/77392
Reviewed-by: Hui Yingst <nigi@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
diff --git a/DEPS b/DEPS
index 2c7d75f..f70e1b4 100644
--- a/DEPS
+++ b/DEPS
@@ -65,7 +65,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling icu
   # and whatever else without interference from each other.
-  'icu_revision': '6a33b647c0647c3eb97eae5432153ef2dfca7baa',
+  'icu_revision': '899e18383fd732b47e6978db2b960a1b2a80179b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling instrumented_lib
   # and whatever else without interference from each other.