Replace absl::optional with std::optional. am: 8cd77735f3 am: 1370af7a89

Original change: https://android-review.googlesource.com/c/platform/external/zucchini/+/3164843

Change-Id: If20bb800128790d3

Replace absl::optional with std::optional. am: 8cd77735f3 am: 1370af7a89

Original change: https://android-review.googlesource.com/c/platform/external/zucchini/+/3164843

Change-Id: If20bb800128790d3ae39c262776f2add917db259
Signed-off-by: Automerger Merge Worker <[email protected]>

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