Update absl and gtest to fix an ARM64EC build error (#18735)
### Description
Update absl and gtest to fix an ARM64EC build error
### Motivation and Context
We need to get an important fix into ORT.
The fix is:
https://github.com/abseil/abseil-cpp/commit/8028a87c96df0fff5ab58daeec30c43ce6fb0d20