Update dependencies

Update everything to latest except for nix. In nix v0.23, a number of
enums were marked #[non_exhaustive]
(nix-rust/nix#1474). Since we want exhaustive
matches in some cases, we will use v0.22 until
non_exhaustive_omitted_patterns_lint is stablized
(rust-lang/rust#89554)

Author: gllghr

Cargo.lock

@@ -39,9 +39,9 @@ panic = "abort" # Save size. We don't need unwinding anyway.
 # if systems are typically configured to dump core on SIGABRT
 
 [dependencies]
-getopts = "0.2.15"
-nix = "0.12.0"
-libc = "0.2.48"
+getopts = "0.2"
+nix = "0.22"
+libc = "0.2"
 
 [package.metadata.deb]
 maintainer = "Delphix Engineering <[email protected]>"