Roll third_party/icu/ 7db579a73..6a33b647c (4 commits)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/7db579a73add..6a33b647c064

Created with:
  roll-dep third_party/icu

Change-Id: I84ea9da26a141f4c7b6ddfb766ab57a87172f18e
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/76796
Commit-Queue: K. Moon <kmoon@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Auto-Submit: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
diff --git a/DEPS b/DEPS
index dd55e7e..16795d5 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': '7db579a73addda0edb2bb83465ae51bcdc601af7',
+  'icu_revision': '6a33b647c0647c3eb97eae5432153ef2dfca7baa',
   # 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.