style: apply rustfmt

Maybe 2024 changes?

Note that we now set `edition = "2024"` explicitly in `rustfmt.toml`.
Without this, it seems like it's possible in some cases for rustfmt to
run under an older edition's style. Not sure how though.

crates/core/flags/config.rs

@@ -10,7 +10,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
-use bstr::{io::BufReadExt, ByteSlice};
+use bstr::{ByteSlice, io::BufReadExt};
 
 /// Return a sequence of arguments derived from ripgrep rc configuration files.
 pub fn args() -> Vec<OsString> {