Roll external/abseil_cpp/ 889ddc99e..49cd3c7a2 (9 commits)

abseil/abseil-cpp@889ddc9...49cd3c7

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': '889ddc99e10c02c7110223e6d0dc41d83f0c0b60',
+  'abseil_revision': '49cd3c7a20fba078a0eaf7903312a0403fe9439e',
 
   'effcee_revision': '514b52ec61609744d7e587d93a7ef9b60407ab45',