Update update-zips so it passes on Windows too

Author: jaraco

importlib_resources/tests/update-zips.py

@@ -21,9 +21,9 @@ def main():
     >>> monkeypatch.setattr(zipfile, 'ZipFile', mock.MagicMock())
     >>> print(); main()  # print workaround for bpo-32509
     <BLANKLINE>
-    .../data01/... -> ziptestdata/...
+    ...data01... -> ziptestdata/...
     ...
-    .../data02/... -> ziptestdata/...
+    ...data02... -> ziptestdata/...
     ...
     """
     suffixes = '01', '02'
@@ -35,7 +35,7 @@ def generate(suffix):
     zfpath = root / f'zipdata{suffix}/ziptestdata.zip'
     with zipfile.ZipFile(zfpath, 'w') as zf:
         for src, rel in walk(root / f'data{suffix}'):
-            dst = 'ziptestdata' / rel
+            dst = 'ziptestdata' / pathlib.PurePosixPath(rel.as_posix())
             print(src, '->', dst)
             zf.write(src, dst)