fix: also support auto when checking for auto annotations

Author: bellini666

strawberry_django_plus/utils/typing.py

@@ -20,8 +20,7 @@
 
 
 def is_auto(type_: Any) -> bool:
-    try:
-        return isinstance(type_, StrawberryAuto)
-    except NameError:
-        # This is to support "from __future__ import annotations" cases
-        return type_ == "strawberry.auto" or type_ == "gql.auto"
+    if isinstance(type_, str):
+        return type_ in ["strawberry.auto", "gql.auto", "auto"]
+
+    return isinstance(type_, StrawberryAuto)