Upgrade kotlinx.serialization to v1.7.3 am: e895eb2f6a

Original change: https://android-review.googlesource.com/c/platform/external/kotlinx.serialization/+/3494856

Change-Id: Id9e066308f5d0b1436df077188cbc9eb520c3190
Signed-off-by: Automerger Merge Worker <[email protected]>