chore: use rustfmt imports_granularity option (#17421)

Closes https://github.com/denoland/deno/issues/2699
Closes https://github.com/denoland/deno/issues/2347

Uses unstable rustfmt features. Since dprint invokes `rustfmt` we do not
need to switch the cargo toolchain to nightly. Do we care about
formatting stability of our codebase across Rust versions? (I don't)

2 files changed, 6 insertions, 3 deletions

diff --git a/ext/flash/sendfile.rs b/ext/flash/sendfile.rs
index 92e8f2bb7..18dc3a39d 100644
--- a/ext/flash/sendfile.rs
+++ b/ext/flash/sendfile.rs
@@ -5,7 +5,8 @@ use std::future::Future;
 use std::io;
 use std::os::unix::io::RawFd;
 use std::pin::Pin;
-use std::task::{self, Poll};
+use std::task::Poll;
+use std::task::{self};
 
 pub struct SendFile {
   pub io: (RawFd, RawFd),
diff --git a/ext/flash/socket.rs b/ext/flash/socket.rs
index 77881d536..27906e74e 100644
--- a/ext/flash/socket.rs
+++ b/ext/flash/socket.rs
@@ -2,9 +2,11 @@
 
 use std::cell::UnsafeCell;
 use std::future::Future;
-use std::io::{Read, Write};
+use std::io::Read;
+use std::io::Write;
 use std::pin::Pin;
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
+use std::sync::Mutex;
 
 use deno_core::error::AnyError;
 use mio::net::TcpStream;