Merge pull request #2765 from cgwalters/drop-openat

rust: Drop `openat` dependency

diff --cc Cargo.toml
index cb83c4dccf6cc24b9ce3b9bf26623e3711cd1df8,099ee0094e9ac46e0fd894b862e7aee20965f6ce..8cee182d4ac0b6afb83a72d62359e1bb6132f49a
--- 1/Cargo.toml
--- 2/Cargo.toml
+++ b/Cargo.toml
@@@ -51,9 -51,8 +51,8 @@@ thiserror = "1.0.20
  
  [dev-dependencies]
  maplit = "1.0.2"
- openat = "0.1.19"
  tempfile = "3"
 -cap-tempfile = "0.25"
 +cap-tempfile = "1.0"
  
  [features]
  cap-std-apis = ["cap-std", "io-lifetimes", "v2017_10"]