Roll external/abseil_cpp/ f489ceb63..3f770c4d9 (4 commits) (#5935)

https://github.com/abseil/abseil-cpp/compare/f489ceb630c6...3f770c4d965d

Created with:
  roll-dep external/abseil_cpp

Co-authored-by: GitHub Actions[bot] <>
diff --git a/DEPS b/DEPS
index 6d537df..999947b 100644
--- a/DEPS
+++ b/DEPS
@@ -3,7 +3,7 @@
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': 'f489ceb630c633fe524ce6e72107e8cc930de14b',
+  'abseil_revision': '3f770c4d965d8511ccc884f0d8515d41ed10fae1',
 
   'effcee_revision': 'e63a164aa0a40a04ddca2c18976819668b5a47a8',