Update ICU

Rolling v8/third_party/icu: https://chromium.googlesource.com/chromium/deps/icu/+log/ea8c08d..a9359a8

Move back to single android icu data file. (Mohamed Heikal)
https://chromium.googlesource.com/chromium/deps/icu/+/a9359a8

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,ftang@chromium.org

Change-Id: I14c6e7b436a98555a4e1ba9e8a0958aaa0d43d57
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3538221
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#79536}

DEPS

@@ -226,7 +226,7 @@ deps = {
   'third_party/googletest/src':
     Var('chromium_url') + '/external/github.com/google/googletest.git' + '@' + 'b007c54f2944e193ac44fba1bc997cb65826a0b9',
   'third_party/icu':
-    Var('chromium_url') + '/chromium/deps/icu.git' + '@' + 'ea8c08d8783fceda86c19618694881149e23f305',
+    Var('chromium_url') + '/chromium/deps/icu.git' + '@' + 'a9359a84a3969b3019db7d62899afb19642eefcd',
   'third_party/instrumented_libraries':
     Var('chromium_url') + '/chromium/src/third_party/instrumented_libraries.git' + '@' + 'e09c4b66b6e87116eb190651421f1a6e2f3b9c52',
   'third_party/ittapi': {