Update ICU

Rolling v8/third_party/icu: https://chromium.googlesource.com/chromium/deps/icu/+log/a9359a8..493fb32

Add eu, gl to CrOS ICU (mlcui)
https://chromium.googlesource.com/chromium/deps/icu/+/493fb32

Cleanup more -Wunused-but-set-variable warnings (Gulfem Savrun Yeniceri)
https://chromium.googlesource.com/chromium/deps/icu/+/a84f25c

Cleanup -Wunused-but-set-variable in warnings (Gulfem Savrun Yeniceri)
https://chromium.googlesource.com/chromium/deps/icu/+/5aab8af

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

Change-Id: I65361315616dd9df84eb90cb747f73b417852c9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3562383
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@{#79683}

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' + '@' + 'a9359a84a3969b3019db7d62899afb19642eefcd',
+    Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '493fb324ba81643b49bed81b31b73e4150b019e5',
   'third_party/instrumented_libraries':
     Var('chromium_url') + '/chromium/src/third_party/instrumented_libraries.git' + '@' + 'e09c4b66b6e87116eb190651421f1a6e2f3b9c52',
   'third_party/ittapi': {