chore(ext): allow clippy::absurd_extreme_comparisons for readability

src/ext/h1_reason_phrase.rs

@@ -147,7 +147,7 @@ const fn is_valid_byte(b: u8) -> bool {
     //
     // The 0xFF comparison is technically redundant, but it matches the text of the spec more
     // clearly and will be optimized away.
-    #[allow(unused_comparisons)]
+    #[allow(unused_comparisons, clippy::absurd_extreme_comparisons)]
     const fn is_obs_text(b: u8) -> bool {
         0x80 <= b && b <= 0xFF
     }