Merge "Upgrade nix to 0.28.0" into main am: 67cb0ae09d

Original change: https://android-review.googlesource.com/c/platform/development/+/3034064

Change-Id: I1d7e4c843058874bded59149479606f7811f3d98
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>