Rollup merge of #56497 - ljedrz:cleanup_libstd_const_lifetimes, r=kennytm

cleanup: remove static lifetimes from consts in libstd

src/libstd/sys/windows/path.rs

@@ -99,5 +99,5 @@ pub fn parse_prefix<'a>(path: &'a OsStr) -> Option<Prefix> {
     }
 }
 
-pub const MAIN_SEP_STR: &'static str = "\\";
+pub const MAIN_SEP_STR: &str = "\\";
 pub const MAIN_SEP: char = '\\';