Roll ICU to fix v8 locale bug

https://chromium.googlesource.com/chromium/deps/icu.git/+log/481b5ca7b..88ea42af73
  88ea42a Sort variants in locale code.

Bug: v8:9741
Change-Id: Iccd5d661d439babaae59f358059bd6c1bb1f0606
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896236Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711941}

DEPS

@@ -1069,7 +1069,7 @@ deps = {
     Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '681ca92480ecc11d35feae8c1c00e4e035630f43',
 
   'src/third_party/icu':
-    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '481b5ca7b68d02be302f312615a66e1d3c77e2b0',
+    Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '88ea42af73f4cd3b8b0d0837403d75a989d80504',
 
   'src/third_party/icu4j': {
       'packages': [