wasi-threads: fix import name (#5748)

* wasi-threads: fix import name

As @TerrorJack pointed out in #5484, that PR implements an older
name--`thread_spawn`. This change uses the now-official name from the
specification--`thread-spawn`.

* fix: update name in test

crates/wasi-threads/src/lib.rs

@@ -112,7 +112,7 @@ pub fn add_to_linker<T: Clone + Send + 'static>(
 ) -> anyhow::Result<SharedMemory> {
     linker.func_wrap(
         "wasi",
-        "thread_spawn",
+        "thread-spawn",
         move |mut caller: Caller<'_, T>, start_arg: i32| -> i32 {
             log::trace!("new thread requested via `wasi::thread_spawn` call");
             let host = caller.data().clone();

tests/all/cli_tests/threads.wat

@@ -6,7 +6,7 @@
     (func $__wasi_fd_write (param i32 i32 i32 i32) (result i32)))
   (import "wasi_snapshot_preview1" "proc_exit"
     (func $__wasi_proc_exit (param i32)))
-  (import "wasi" "thread_spawn"
+  (import "wasi" "thread-spawn"
     (func $__wasi_thread_spawn (param i32) (result i32)))
 
   (func (export "_start")