Roll external/abseil_cpp/ 8f739d18b..917bfee46 (2 commits) (KhronosGroup#5887)

abseil/abseil-cpp@8f739d1...917bfee

Created with:
  roll-dep external/abseil_cpp

Co-authored-by: GitHub Actions[bot] <>

Author: github-actions[bot]

DEPS

@@ -3,7 +3,7 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': '8f739d18b9d6cbf96d8143779888de0e984ba96b',
+  'abseil_revision': '917bfee46514a1da47df74265571f47700922c0a',
 
   'effcee_revision': '2c97e5689ed8d7ab6ae5820f884f03a601ae124b',