clippy:fix needless_lifetime warnings

Running clippy with the enabled "net" feature reported several
needless_lifetime warnings. This commit fixes them by switching to
anonymous lifetimes.

Versions:
  cargo 1.89.0 (c24e10642 2025-06-23)
  clippy 0.1.89 (29483883ee 2025-08-04)

Command:
 cargo clippy --features net

Author: alexs-sh

src/net/tcp/stream.rs

@@ -284,7 +284,7 @@ impl Read for TcpStream {
     }
 }
 
-impl<'a> Read for &'a TcpStream {
+impl Read for &'_ TcpStream {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         self.inner.do_io(|mut inner| inner.read(buf))
     }
@@ -308,7 +308,7 @@ impl Write for TcpStream {
     }
 }
 
-impl<'a> Write for &'a TcpStream {
+impl Write for &'_ TcpStream {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.inner.do_io(|mut inner| inner.write(buf))
     }

src/net/uds/stream.rs

@@ -161,7 +161,7 @@ impl Read for UnixStream {
     }
 }
 
-impl<'a> Read for &'a UnixStream {
+impl Read for &'_ UnixStream {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         self.inner.do_io(|mut inner| inner.read(buf))
     }
@@ -185,7 +185,7 @@ impl Write for UnixStream {
     }
 }
 
-impl<'a> Write for &'a UnixStream {
+impl Write for &'_ UnixStream {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.inner.do_io(|mut inner| inner.write(buf))
     }