Update get_return_annotation test

Author: kianelbo

src/_pytest/fixtures.py

@@ -2015,7 +2015,7 @@ def _showfixtures_main(config: Config, session: Session) -> None:
         tw.line()
 
 
-def get_return_annotation(fixture_func: Callable) -> str:
+def get_return_annotation(fixture_func: Callable[..., Any]) -> str:
     try:
         sig = signature(fixture_func)
         annotation = sig.return_annotation

testing/python/fixtures.py

@@ -5098,7 +5098,7 @@ def six() -> int:
     def two_sixes() -> tuple[int, str]:
         return (6, "six")
 
-    assert get_return_annotation(two_sixes) == "Tuple[int, str]"
+    assert get_return_annotation(two_sixes) == "tuple[int, str]"
 
     def no_annot():
         return 6
@@ -5109,3 +5109,5 @@ def none_return() -> None:
         pass
 
     assert get_return_annotation(none_return) == "None"
+
+    assert get_return_annotation(range) == ""