dep: bump xcb to 1.6.0

switch from the deprecated API we found unsoundness in to the one introduced in 1.6.0

src/lib.rs

@@ -60,12 +60,6 @@ pub fn main(mut data: impl RunData) -> Option<()> {
     data.created_server();
 
     let (xsock_wl, xsock_xwl) = UnixStream::pair().unwrap();
-    // XCB takes responsibility for cleaning up this FD, but since connecting takes a RawFd at the
-    // FFI level, see (`XState::new`), `xsock_wl`'s destructor also closes the FD, leading the FD
-    // being closed twice. This mainly caused problems in the integration tests, where `xsock_wl`'s
-    // destructor would be run after the descriptor was freed, leading to an opaque abort message.
-    // See https://github.com/rust-x-bindings/rust-xcb/issues/282 for further explanation.
-    let xsock_wl = Box::leak(Box::new(xsock_wl));
     // Prevent creation of new Xwayland command from closing fd
     rustix::io::fcntl_setfd(&xsock_xwl, rustix::io::FdFlags::empty()).unwrap();
 

src/xstate/mod.rs

@@ -9,7 +9,7 @@ use bitflags::bitflags;
 use log::{debug, trace, warn};
 use std::collections::HashMap;
 use std::ffi::CString;
-use std::os::fd::{AsRawFd, BorrowedFd};
+use std::os::fd::BorrowedFd;
 use std::rc::Rc;
 use xcb::{x, Xid, XidNew};
 use xcb_util_cursor::{Cursor, CursorContext};
@@ -124,8 +124,8 @@ pub struct XState {
 impl XState {
     pub fn new(fd: BorrowedFd) -> Self {
         let connection = Rc::new(
-            xcb::Connection::connect_to_fd_with_extensions(
-                fd.as_raw_fd(),
+            xcb::Connection::connect_with_fd_and_extensions(
+                BorrowedFd::try_clone_to_owned(&fd).unwrap(),
                 None,
                 &[
                     xcb::Extension::Composite,