Roll ICU to fix locale -t- extension issue

https://chromium.googlesource.com/chromium/deps/icu.git/+log/5c3a0b9..899e1838

TBR=jshin@chromium.org

Bug: v8:11039
Change-Id: I111a7aaec74c909f4e3a68a9fcd44500ebb42392
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591229Reviewed-by: Frank Tang <ftang@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836875}

DEPS

@@ -1068,7 +1068,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '18e09b9197a3b1d771c077c530d1a4ebad04c167',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '5c3a0b95802abf409c686ed3534dd46296c1dfb5',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '899e18383fd732b47e6978db2b960a1b2a80179b',
 
   'src/third_party/icu4j': {
       'packages': [