Roll ICU from b929596baebf to 1b2e3e8a421e (7 revisions) (flutter#173436)

https://chromium.googlesource.com/chromium/deps/icu.git/+log/b929596baebf..1b2e3e8a421e

2025-07-14 dayeung@chromium.org Added foolip's chromium account and
removed syg from owners
2025-07-14 tikuta@chromium.org fuzzers/icu_to_case_fuzzer.cc: Add
missing include
2025-05-27 foolip@chromium.org Make scripts/update_tz.sh work on macOS
2025-05-27 foolip@chromium.org Fix Android typos in README.chromium
2025-05-23 foolip@chromium.org Update name_5_langs.patch to avoid
whitespace errors
2025-05-22 dayeung@chromium.org Add foolip to owners file
2025-05-22 foolip@chromium.org Fix tar invocation to work on macOS

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/icu-sdk-flutter
Please CC codefu@google.com,fuchsia-ui-discuss@google.com on the revert
to ensure that a human
is aware of the problem.

To file a bug in ICU: https://github.com/unicode-org/icu
To file a bug in Flutter:
https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: engine-flutter-autoroll

DEPS

@@ -259,7 +259,7 @@ deps = {
    Var('chromium_git') + '/external/github.com/google/flatbuffers' + '@' + '0a80646371179f8a7a5c1f42c31ee1d44dcf6709',
 
   'engine/src/flutter/third_party/icu':
-   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'b929596baebf0ab4ac7ec07f38365db4c50a559d',
+   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '1b2e3e8a421efae36141a7b932b41e315b089af8',
 
    'engine/src/flutter/third_party/gtest-parallel':
    Var('chromium_git') + '/external/github.com/google/gtest-parallel' + '@' + '38191e2733d7cbaeaef6a3f1a942ddeb38a2ad14',