Fix async sort filter

src/jinja2/filters.py

@@ -383,7 +383,7 @@ def sort_func(item: t.Tuple[t.Any, t.Any]) -> t.Any:
 
 
 @pass_environment
-def do_sort(
+def sync_do_sort(
     environment: "Environment",
     value: "t.Iterable[V]",
     reverse: bool = False,
@@ -438,6 +438,20 @@ def do_sort(
     return sorted(value, key=key_func, reverse=reverse)
 
 
+@async_variant(sync_do_sort)  # type: ignore
+async def do_sort(
+    environment: "Environment",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    reverse: bool = False,
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.List[V]":
+    key_func = make_multi_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    return sorted(await auto_to_list(value), key=key_func, reverse=reverse)
+
+
 @pass_environment
 def sync_do_unique(
     environment: "Environment",

tests/test_async_filters.py

@@ -218,6 +218,12 @@ def test_simple_map(env_async, items):
     assert tmpl.render(items=items) == "6"
 
 
+@mark_dualiter("items", lambda: list("1423"))
+def test_simple_map_sort(env_async, items):
+    tmpl = env_async.from_string('{{ items()|map("int")|sort }}')
+    assert tmpl.render(items=items) == "[1, 2, 3, 4]"
+
+
 def test_map_sum(env_async):  # async map + async filter
     tmpl = env_async.from_string('{{ [[1,2], [3], [4,5,6]]|map("sum")|list }}')
     assert tmpl.render() == "[3, 3, 15]"