Suppress unknown_lints lint

This is to prevent stable from complaining about nightly-only lints.

Closes fish-shell#10354

Cargo.toml

@@ -70,6 +70,7 @@ asan = []
 [lints]
 rust.non_camel_case_types = "allow"
 rust.non_upper_case_globals = "allow"
+rust.unknown_lints = "allow"
 rust.unstable_name_collisions = "allow"
 clippy.assigning_clones = "allow"
 clippy.bool_assert_comparison = "allow"

src/bin/fish_indent.rs

@@ -1,5 +1,6 @@
 //! The fish_indent program.
 
+#![allow(unknown_lints)]
 // Delete this once we require Rust 1.74.
 #![allow(unstable_name_collisions)]
 #![allow(clippy::incompatible_msrv)]

src/lib.rs

@@ -1,6 +1,7 @@
 #![cfg_attr(feature = "benchmark", feature(test))]
 #![allow(non_camel_case_types)]
 #![allow(non_upper_case_globals)]
+#![allow(unknown_lints)]
 #![allow(unstable_name_collisions)]
 #![allow(clippy::assigning_clones)]
 #![allow(clippy::bool_assert_comparison)]