ci: bump nightly to nightly-2024-05-05 (#6538)

tokio-util/src/codec/length_delimited.rs

@@ -639,7 +639,6 @@ mod builder {
     impl LengthFieldType for u64 {}
 
     #[cfg(any(
-        target_pointer_width = "8",
         target_pointer_width = "16",
         target_pointer_width = "32",
         target_pointer_width = "64",

tokio-util/src/lib.rs

@@ -1,3 +1,4 @@
+#![allow(unknown_lints, unexpected_cfgs)]
 #![allow(clippy::needless_doctest_main)]
 #![warn(
     missing_debug_implementations,

tokio-util/tests/task_join_map.rs

@@ -1,3 +1,4 @@
+#![allow(unknown_lints, unexpected_cfgs)]
 #![warn(rust_2018_idioms)]
 #![cfg(all(feature = "rt", tokio_unstable))]