fix(update-v8): remove abseil-cpp from V8 dependencies (#567)

It was removed upstream because of issues with GCC.

Author: targos

lib/update-v8/constants.js

@@ -41,12 +41,6 @@ exports.v8Deps = [
     },
     since: 55
   },
-  {
-    name: 'abseil-cpp',
-    repo: 'third_party/abseil-cpp',
-    gitignore: '!third_party/abseil-cpp',
-    since: 96
-  },
   {
     name: 'gtest',
     repo: 'testing/gtest',