tee: use retain_mut from std instead of the deprecated retain_mut crate

Cargo.lock

@@ -1825,12 +1825,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "retain_mut"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c31b5c4033f8fdde8700e4657be2c497e7288f01515be52168c631e2e4d4086"
-
 [[package]]
 name = "rlimit"
 version = "0.8.3"
@@ -3116,7 +3110,6 @@ version = "0.0.17"
 dependencies = [
  "clap",
  "libc",
- "retain_mut",
  "uucore",
 ]
 

Cargo.toml

@@ -309,7 +309,6 @@ rand_core = "0.6"
 rayon = "1.5"
 redox_syscall = "0.2"
 regex = "1.7.1"
-retain_mut = "0.1.7"
 rust-ini = "0.18.0"
 same-file = "1.0.6"
 selinux = "0.3"

src/uu/tee/Cargo.toml

@@ -17,7 +17,6 @@ path = "src/tee.rs"
 [dependencies]
 clap = { workspace=true }
 libc = { workspace=true }
-retain_mut = { workspace=true }
 uucore = { workspace=true, features=["libc"] }
 
 [[bin]]

src/uu/tee/src/tee.rs

@@ -6,7 +6,6 @@
 //  * file that was distributed with this source code.
 
 use clap::{builder::PossibleValue, crate_version, Arg, ArgAction, Command};
-use retain_mut::RetainMut;
 use std::fs::OpenOptions;
 use std::io::{copy, sink, stdin, stdout, Error, ErrorKind, Read, Result, Write};
 use std::path::PathBuf;
@@ -301,7 +300,7 @@ impl Write for MultiWriter {
         let mut aborted = None;
         let mode = self.output_error_mode.clone();
         let mut errors = 0;
-        RetainMut::retain_mut(&mut self.writers, |writer| {
+        self.writers.retain_mut(|writer| {
             let result = writer.write_all(buf);
             match result {
                 Err(f) => {
@@ -332,7 +331,7 @@ impl Write for MultiWriter {
         let mut aborted = None;
         let mode = self.output_error_mode.clone();
         let mut errors = 0;
-        RetainMut::retain_mut(&mut self.writers, |writer| {
+        self.writers.retain_mut(|writer| {
             let result = writer.flush();
             match result {
                 Err(f) => {