Roll external/googletest/ 8b5333659..8240fa7d6 (8 commits)

https://github.com/google/googletest/compare/8b53336594cc...8240fa7d62f7

Created with:
  roll-dep external/googletest

Roll external/abseil_cpp/ 35b9f25ba..db1bdc86e (37 commits)

https://github.com/abseil/abseil-cpp/compare/35b9f25ba74a...db1bdc86effd

Created with:
  roll-dep external/abseil_cpp

Roll external/spirv-headers/ 8d56066ee..29981f652 (3 commits)


https://github.com/KhronosGroup/SPIRV-Headers/compare/8d56066eee52...29981f652416

Created with:
  roll-dep external/spirv-headers