Update kotlinc to 1.7.20 am: 4e3c9ce7ac

Original change: https://android-review.googlesource.com/c/platform/external/kotlinc/+/2055028

Change-Id: I1862b0b4daf92e5bc859ebe61e90d59b7ef45836
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>