Upgrade nix to 0.28.0 am: 33265a2e3a

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/nix/+/3032729

Change-Id: Id3785609ffe18aadc33fb4920623ea48cfcc47b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>