Fix clippy warnings

packable/packable/tests/bool.rs

@@ -16,7 +16,7 @@ fn packable_bool_packed_non_zero_bytes_are_truthy() {
     let mut packer = Vec::default();
     42u8.pack(&mut packer).unwrap();
 
-    let is_true = bool::unpack_verified(&mut packer.as_slice(), &()).unwrap();
+    let is_true = bool::unpack_verified(packer.as_slice(), &()).unwrap();
 
     assert!(is_true);
 }

packable/packable/tests/common/mod.rs

@@ -52,7 +52,7 @@ where
 
     let mut vec = Vec::new();
     packable.pack(&mut vec).unwrap();
-    let unpacked = P::unpack_verified(&mut vec.as_slice(), &()).unwrap();
+    let unpacked = P::unpack_verified(vec.as_slice(), &()).unwrap();
     assert_eq!(packable, &unpacked);
 
     // Tests for `Read` and `Write`

prefix-hex/tests/data.rs

@@ -59,7 +59,7 @@ fn array_encode() {
 #[test]
 fn array_reference_encode() {
     assert_eq!(
-        prefix_hex::encode(&[0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]),
+        prefix_hex::encode([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]),
         "0x0123456789abcdef"
     );
 }