Update ICU (and sfntly) to latest version (as used by Chromium)

We were ~2.5 years behind. Most importantly, there's a compile fix for
Windows-on-ARM64 that's needed to continue development of that target.

Bug: skia:8569
Change-Id: I9dd2c85111113061dcff697ba5beedb838f3ff9b
Reviewed-on: https://skia-review.googlesource.com/c/175580
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/DEPS b/DEPS
index 8a2f270..2210c39 100644
--- a/DEPS
+++ b/DEPS
@@ -13,7 +13,7 @@
   "third_party/externals/expat"           : "https://android.googlesource.com/platform/external/expat.git@android-6.0.1_r55",
   "third_party/externals/freetype"        : "https://skia.googlesource.com/third_party/freetype2.git@7edc937fe679d14d66f55cf6f7fa607925d38f3c",
   "third_party/externals/harfbuzz"        : "https://skia.googlesource.com/third_party/harfbuzz.git@8be74d85534534dbdd39a0a6f496e26e9f3e661d",
-  "third_party/externals/icu"             : "https://chromium.googlesource.com/chromium/deps/icu.git@ec9c1133693148470ffe2e5e53576998e3650c1d",
+  "third_party/externals/icu"             : "https://chromium.googlesource.com/chromium/deps/icu.git@407b39301e71006b68bd38e770f35d32398a7b14",
   "third_party/externals/imgui"           : "https://skia.googlesource.com/external/github.com/ocornut/imgui.git@bc6ac8b2aee0614debd940e45bc9cd0d9b355c86",
   # TODO: remove jsoncpp after migrating clients to SkJSON
   "third_party/externals/jsoncpp"         : "https://chromium.googlesource.com/external/github.com/open-source-parsers/jsoncpp.git@1.0.0",
@@ -26,7 +26,7 @@
   "third_party/externals/opengl-registry" : "https://skia.googlesource.com/external/github.com/KhronosGroup/OpenGL-Registry@14b80ebeab022b2c78f84a573f01028c96075553",
   "third_party/externals/piex"            : "https://android.googlesource.com/platform/external/piex.git@bb217acdca1cc0c16b704669dd6f91a1b509c406",
   "third_party/externals/sdl"             : "https://skia.googlesource.com/third_party/sdl@5d7cfcca344034aff9327f77fc181ae3754e7a90",
-  "third_party/externals/sfntly"          : "https://chromium.googlesource.com/external/github.com/googlei18n/sfntly.git@b18b09b6114b9b7fe6fc2f96d8b15e8a72f66916",
+  "third_party/externals/sfntly"          : "https://chromium.googlesource.com/external/github.com/googlei18n/sfntly.git@b55ff303ea2f9e26702b514cf6a3196a2e3e2974",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@661ad91124e6af2272afd00f804d8aa276e17107",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@e9e4393b1c5aad7553c05782acefbe32b42644bd",
   "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@f8374cf0e75c0b44782ce903622a9fed1a1d709e",