Roll external/abseil_cpp/ 04f3bc01d..8a6b6ae90 (50 commits)

abseil/abseil-cpp@04f3bc0...8a6b6ae

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': '04f3bc01d12cf58c90a1bb68990f087fa3c3ed19',
+  'abseil_revision': '8a6b6ae902ac1eb7d9d8db810ecabc9c3cf88cf5',
 
   'effcee_revision': 'ae38e040cbb7e83efa8bfbb4967e5b8c8c89b55a',