Removed blank line that caused CI error

library/core/src/str/mod.rs

@@ -2357,7 +2357,6 @@ pub fn is_char_boundary(&self, index: usize) -> bool {
     #[allow(unused_attributes)]
     #[allow_internal_unstable(const_fn_union)]
     pub const fn as_bytes(&self) -> &[u8] {
-
         // SAFETY: const sound because we transmute two types with the same layout
         unsafe { StrOrSlice { str: self }.slice }
     }