roll deps (KhronosGroup#6129)

* Roll external/abseil_cpp/ 4eb1e49cf..9a89ea871 (20 commits)

abseil/abseil-cpp@4eb1e49...9a89ea8

Created with:
  roll-dep external/abseil_cpp --update-readme

* Roll external/spirv-headers/ 3786ee89d..6d0784e9f (4 commits)

KhronosGroup/SPIRV-Headers@3786ee8...6d0784e

Created with:
  roll-dep external/spirv-headers --update-readme

* Roll external/effcee/ abcaf70f2..8ce15c424 (1 commit)

google/effcee@abcaf70...8ce15c4

Created with:
  roll-dep external/effcee --update-readme

---------

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

Author: github-actions[bot]

DEPS

@@ -3,9 +3,9 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': '4eb1e49cf32ac70dd1d393812ecbcad1d90af68e',
+  'abseil_revision': '9a89ea8714c06aee702058c6acc094bff02dfd42',
 
-  'effcee_revision': 'abcaf70f288ae9f7816b72b2a36fe4add4719a48',
+  'effcee_revision': '8ce15c424e61a94ee27b5be0ec0ed036b158e6e3',
 
   'googletest_revision': '90a41521142c978131f38c6da07b4eb96a9f1ff6',
 
@@ -14,7 +14,7 @@ vars = {
 
   're2_revision': 'c84a140c93352cdabbfb547c531be34515b12228',
 
-  'spirv_headers_revision': '3786ee89d584f5ba46f31dc5253e6dfaa222e5c1',
+  'spirv_headers_revision': '6d0784e9f1ab92c17eeea94821b2465c14a52be9',
 }
 
 deps = {