roll deps (KhronosGroup#6326)

* Roll external/googletest/ 7917641ff..4969d0ad5 (2 commits)

google/googletest@7917641...4969d0a

Created with:
  roll-dep external/googletest

* Roll external/abseil_cpp/ dc242cce4..e8c1a5ff2 (3 commits)

abseil/abseil-cpp@dc242cc...e8c1a5f

Created with:
  roll-dep external/abseil_cpp

---------

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

Author: github-actions[bot]

DEPS

@@ -3,11 +3,11 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': 'dc242cce4187c22525361959c7916d0ee0bcd658',
+  'abseil_revision': 'e8c1a5ff2346d40be5f2450044c01c845777cc02',
 
   'effcee_revision': '514b52ec61609744d7e587d93a7ef9b60407ab45',
 
-  'googletest_revision': '7917641ff965959afae189afb5f052524395525c',
+  'googletest_revision': '4969d0ad540da8fc9944e99457361dc7e35943c2',
 
   # Use protobufs before they gained the dependency on abseil
   'protobuf_revision': 'v21.12',