Fix str2bool failure on stubsabot dry-run (#12287)

scripts/stubsabot.py

@@ -230,11 +230,16 @@ async def release_contains_py_typed(release_to_download: PypiReleaseDownload, *,
         with zipfile.ZipFile(body) as zf:
             return all_py_files_in_source_are_in_py_typed_dirs(zf)
     elif packagetype == "sdist":
-        assert release_to_download.filename.endswith(
-            ".tar.gz"
-        ), f"Package file {release_to_download.filename!r} does not end with '.tar.gz'"
-        with tarfile.open(fileobj=body, mode="r:gz") as zf:
-            return all_py_files_in_source_are_in_py_typed_dirs(zf)
+        # sdist defaults to `.tar.gz` on Lunix and to `.zip` on Windows:
+        # https://docs.python.org/3.11/distutils/sourcedist.html
+        if release_to_download.filename.endswith(".tar.gz"):
+            with tarfile.open(fileobj=body, mode="r:gz") as zf:
+                return all_py_files_in_source_are_in_py_typed_dirs(zf)
+        elif release_to_download.filename.endswith(".zip"):
+            with zipfile.ZipFile(body) as zf:
+                return all_py_files_in_source_are_in_py_typed_dirs(zf)
+        else:
+            raise AssertionError(f"Package file {release_to_download.filename!r} does not end with '.tar.gz' or '.zip'")
     else:
         raise AssertionError(f"Unknown package type for {release_to_download.distribution}: {packagetype!r}")