fix(lint): fix a new lint for the last clippy version

zebra-chain/src/sapling/keys.rs

@@ -91,7 +91,7 @@ pub(super) fn find_group_hash(d: [u8; 8], m: &[u8]) -> jubjub::ExtendedPoint {
         let gh = jubjub_group_hash(d, &tag[..]);
 
         // We don't want to overflow and start reusing generators
-        assert!(tag[i] != u8::max_value());
+        assert!(tag[i] != u8::MAX);
         tag[i] += 1;
 
         if let Some(gh) = gh {

zebra-chain/src/serialization/tests/preallocate.rs

@@ -77,7 +77,7 @@ fn u8_deser_throws_when_input_too_large() {
 /// Confirm that every u8 takes exactly 1 byte when serialized.
 /// This verifies that our calculated `MAX_U8_ALLOCATION` is indeed an upper bound.
 fn u8_size_is_correct() {
-    for byte in std::u8::MIN..=std::u8::MAX {
+    for byte in u8::MIN..=u8::MAX {
         let serialized = byte
             .zcash_serialize_to_vec()
             .expect("Serialization to vec must succeed");

zebra-chain/src/work/difficulty/arbitrary.rs

@@ -49,7 +49,7 @@ impl Arbitrary for Work {
         // In the Zcash protocol, a Work is converted from an ExpandedDifficulty.
         // But some randomised difficulties are impractically large, and will
         // never appear in any real-world block. So we just use a random Work value.
-        (1..std::u128::MAX).prop_map(Work).boxed()
+        (1..u128::MAX).prop_map(Work).boxed()
     }
 
     type Strategy = BoxedStrategy<Self>;