gpui: Fix update_window to borrow_mut will crash on Windows (#24545)

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 https://github.com/tauri-apps/wry/pull/1383 on Windows can
replay the crash.

In fact, we had done [a similar fix around August last
year](https://github.com/huacnlee/zed/pull/6), 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`.


691de6b4b3/crates/gpui/src/app.rs (L70-L78)

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

Co-authored-by: Sunli <scott_s829@163.com>

crates/gpui/src/app/async_context.rs

@@ -88,7 +88,7 @@ impl AppContext for AsyncApp {
         F: FnOnce(AnyView, &mut Window, &mut App) -> T,
     {
         let app = self.app.upgrade().context("app was released")?;
-        let mut lock = app.borrow_mut();
+        let mut lock = app.try_borrow_mut()?;
         lock.update_window(window, f)
     }