Upgrade kotlinx.serialization to v1.6.3 am: 3eabe70bae am: 0613cddefb

Original change: https://android-review.googlesource.com/c/platform/external/kotlinx.serialization/+/3058343

Change-Id: I05e5687fb427f87d78a0ebd9428608f52eaa26bd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>