gpui: Fix update_window to borrow_mut will crash on Windows

[huacnlee]

Release Notes:

• N/A

---

When we use window_handle to draw WebView on Windows, this will crash by:

This error caused by when used WebView2.

thread 'main' panicked at crates\gpui\src\app\async_context.rs:91:28:
already borrowed: BorrowMutError
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at library\core\src\panicking.rs:221:5:
panic in a function that cannot unwind

Try this tauri-apps/wry#1383 on Windows can replay the crash.

In fact, we had done a similar fix around August last year, but we used the unsafe method to avoid crashes in that version, we felt that it was not a good change, so we do not make PR.

Today @sunli829 thought about it again and changed the method. Now using try_borrow_mut is similar to the previous borrow_mut.

zed/crates/gpui/src/app.rs

Lines 70 to 78 in 691de6b

	#[doc(hidden)]
	#[track_caller]
	pub fn borrow_mut(&self) -> AppRefMut {
	if option_env!("TRACK_THREAD_BORROWS").is_some() {
	let thread_id = std::thread::current().id();
	eprintln!("borrowed {thread_id:?}");
	}
	AppRefMut(self.app.borrow_mut())
	}

I have tested to start Zed by those changes, it is looks no problem.

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[huacnlee]

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