Replace libchrome NumberToString with std::format am: 1f46f5bb7b

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3310753

Change-Id: I1348195e7c4bf9e46327318fb1f03661e5eaaee5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>