Ignore trait_duplication_in_bounds clippy false positives

rust-lang/rust-clippy#8757

    error: this trait bound is already specified in the where clause
      --> tests/regression/issue845.rs:13:8
       |
    13 |     T: TryFrom<u64> + TryFrom<i64> + FromStr,
       |        ^^^^^^^^^^^^
       |
       = note: `-D clippy::trait-duplication-in-bounds` implied by `-D clippy::pedantic`
       = help: consider removing this trait bound
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds

    error: this trait bound is already specified in the where clause
      --> tests/regression/issue845.rs:14:33
       |
    14 |     <T as TryFrom<u64>>::Error: Display,
       |                                 ^^^^^^^
       |
       = help: consider removing this trait bound
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds

    error: this trait bound is already specified in the where clause
      --> tests/regression/issue845.rs:49:8
       |
    49 |     T: TryFrom<u64> + TryFrom<i64> + FromStr,
       |        ^^^^^^^^^^^^
       |
       = help: consider removing this trait bound
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds

    error: this trait bound is already specified in the where clause
      --> tests/regression/issue845.rs:50:33
       |
    50 |     <T as TryFrom<u64>>::Error: Display,
       |                                 ^^^^^^^
       |
       = help: consider removing this trait bound
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds

tests/regression/issue845.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::trait_duplication_in_bounds)] // https://github.com/rust-lang/rust-clippy/issues/8757
+
 use serde::{Deserialize, Deserializer};
 use std::convert::TryFrom;
 use std::fmt::{self, Display};