Update to cap-std 3, bump to 4

Cargo.toml

@@ -8,11 +8,11 @@ name = "cap-std-ext"
 readme = "README.md"
 repository = "https://github.com/coreos/cap-std-ext"
 # For historical reasons, the major version number is one greater than the cap-std major.
-version = "3.0.1"
+version = "4.0.0"
 
 [dependencies]
-cap-tempfile = "2"
-cap-primitives = "2"
+cap-tempfile = "3"
+cap-primitives = "3"
 
 [target.'cfg(not(windows))'.dependencies]
 rustix = { version = "0.38", features = ["fs", "procfs", "process", "pipe"] }

src/dirext.rs

@@ -71,7 +71,7 @@ pub trait CapStdExtDirExt {
     /// somedir.atomic_replace_with("somefilename", |f| -> io::Result<_> {
     ///     f.write_all(contents)?;
     ///     f.flush()?;
-    ///     use std::os::unix::prelude::PermissionsExt;
+    ///     use cap_std::fs::PermissionsExt;
     ///     let perms = cap_std::fs::Permissions::from_mode(0o600);
     ///     f.get_mut().as_file_mut().set_permissions(perms)?;
     ///     Ok(())
@@ -276,7 +276,7 @@ impl CapStdExtDirExt for Dir {
             // secret data.
             #[cfg(unix)]
             {
-                use std::os::unix::prelude::PermissionsExt;
+                use cap_std::fs::PermissionsExt;
                 let perms = cap_std::fs::Permissions::from_mode(0o600);
                 f.get_mut().as_file_mut().set_permissions(perms)?;
             }

tests/it/main.rs

@@ -1,11 +1,10 @@
 use anyhow::Result;
 
-use cap_std::fs::{Dir, File, Permissions};
+use cap_std::fs::{Dir, File, Permissions, PermissionsExt};
 use cap_std_ext::cap_std;
 use cap_std_ext::cmdext::CapStdExtCommandExt;
 use cap_std_ext::dirext::CapStdExtDirExt;
 use std::io::Write;
-use std::os::unix::prelude::PermissionsExt;
 use std::path::Path;
 use std::{process::Command, sync::Arc};