Roll external/abseil_cpp/ 0e5031d3c..4ff7ff9ee (86 commits)

abseil/abseil-cpp@0e5031d...4ff7ff9

Created with:
  roll-dep external/abseil_cpp

Author: GitHub Actions[bot]

DEPS

@@ -3,7 +3,7 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': '0e5031d3c00d8a482cd5705b5d006518447f39da',
+  'abseil_revision': '4ff7ff9ee91464682e2916af9ae0d62357001dc4',
 
   'effcee_revision': '514b52ec61609744d7e587d93a7ef9b60407ab45',