fix(dispatch2): Add 'static bound to exec_async

Closes madsmtm#689.

Author: jesdazrez

crates/dispatch2/src/queue.rs

@@ -226,7 +226,9 @@ impl Queue {
     /// Submit a function for asynchronous execution on the [Queue].
     pub fn exec_async<F>(&self, work: F)
     where
-        F: Send + FnOnce(),
+        // We need `'static` to make sure any referenced values are borrowed for
+        // long enough since `work` will be performed asynchronously.
+        F: Send + FnOnce() + 'static,
     {
         let work_boxed = Box::into_raw(Box::new(work)).cast();