Upgrade nix to 0.27.1 am: 61f371d4fb am: 7f1d2c4adb am: 86c2a71e6d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/nix/+/2828065

Change-Id: Id4c4b6b1f303ca742527f968d8082f4e702d7cc3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>