Roll third_party/icu/ 682a23092..53f6b233a (6 commits)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/682a23092393..53f6b233a41e

Created with:
  roll-dep third_party/icu

TBR=dsinclair@chromium.org
Change-Id: Ie82f4470d2db706b74c1542bb573e25d2ea3ab66
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60335
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 8f64b1a..5a47967 100644
--- a/DEPS
+++ b/DEPS
@@ -22,7 +22,7 @@
   'depot_tools_revision': 'e5641be5fe309f40aad850d4d1e1ca607768572c',
   'freetype_revision': '3de1b8d0b0983cf49a187a4227e7950395a3b08f',
   'gtest_revision': '3a45039862471cc2785e92bd19bd146c70344986',
-  'icu_revision': '682a230923933a7157a41b88c7804b6b7d2abdfa',
+  'icu_revision': '53f6b233a41ec982d8445996247093f7aaf41639',
   'instrumented_lib_revision': 'b1c3ca20848c117eb935b02c25d441f03e6fbc5e',
   'jinja2_revision': '45571de473282bd1d8b63a8dfcb1fd268d0635d2',
   'jpeg_turbo_revision': 'baa5dc24258bf9af873b9105e8988c558c425a17',