Rollup merge of #131267 - okaneco:bufread_skip_until, r=tgross35

Stabilize `BufRead::skip_until`
FCP completed #111735 (comment)Closes#111735

Author: workingjubilee

library/std/src/io/mod.rs

@@ -2382,8 +2382,6 @@ pub trait BufRead: Read {
 /// about Ferris from a binary string, skipping the fun fact:
 ///
 /// ```
-/// #![feature(bufread_skip_until)]
-///
 /// use std::io::{self, BufRead};
 ///
 /// let mut cursor = io::Cursor::new(b"Ferris\0Likes long walks on the beach\0Crustacean\0");
@@ -2407,7 +2405,7 @@ pub trait BufRead: Read {
 /// assert_eq!(num_bytes, 11);
 /// assert_eq!(animal, b"Crustacean\0");
 /// ```
-#[unstable(feature = "bufread_skip_until",issue = "111735")]
+#[stable(feature = "bufread_skip_until",since = "CURRENT_RUSTC_VERSION")]
 fnskip_until(&mutself,byte:u8) -> Result<usize>{
 skip_until(self, byte)
 }