hashsum: update hex to 0.4.3

Update to API change.

Cargo.lock

@@ -957,9 +957,9 @@ dependencies = [
 
 [[package]]
 name = "hex"
-version = "0.2.0"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6a22814455d41612f41161581c2883c0c6a1c41852729b17d5ed88f01e153aa"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hex-literal"

src/uu/hashsum/Cargo.toml

@@ -17,7 +17,7 @@ path = "src/hashsum.rs"
 [dependencies]
 digest = "0.10.1"
 clap = { version = "3.0", features = ["wrap_help", "cargo"] }
-hex = "0.2.0"
+hex = "0.4.3"
 libc = "0.2.42"
 memchr = "2"
 md5 = "0.3.5"

src/uu/hashsum/src/digest.rs

@@ -14,7 +14,7 @@ extern crate sha3;
 
 use std::io::Write;
 
-use hex::ToHex;
+use hex::encode;
 #[cfg(windows)]
 use memchr::memmem;
 
@@ -32,7 +32,7 @@ pub trait Digest {
     fn result_str(&mut self) -> String {
         let mut buf: Vec<u8> = vec![0; self.output_bytes()];
         self.result(&mut buf);
-        buf.to_hex()
+        encode(buf)
     }
 }
 

src/uu/hashsum/src/hashsum.rs

@@ -21,7 +21,7 @@ use self::digest::Digest;
 use self::digest::DigestWriter;
 
 use clap::{App, AppSettings, Arg, ArgMatches};
-use hex::ToHex;
+use hex::encode;
 use md5::Context as Md5;
 use regex::Regex;
 use sha1::Sha1;
@@ -652,6 +652,6 @@ fn digest_reader<T: Read>(
         let mut bytes = Vec::new();
         bytes.resize((output_bits + 7) / 8, 0);
         digest.result(&mut bytes);
-        Ok(bytes.to_hex())
+        Ok(encode(bytes))
     }
 }