Address OBO download issue

Author: cthoyt

pyproject.toml

@@ -68,7 +68,7 @@ dependencies = [
     "humanize",
     "tabulate",
     "cachier",
-    "pystow>=0.8.8",
+    "pystow>=0.8.11",
     "bioversions>=0.9.1",
     "bioregistry>=0.13.44",
     "ssslm>=0.1.3",

src/pyobo/getters.py

@@ -214,7 +214,7 @@ def _ensure_ontology_path(
         if url is None:
             continue
         try:
-            path = ensure_path(prefix, url=url, force=force, version=version)
+            path = ensure_path(prefix, url=url, force=force, version=version, backend="requests")
         except (urllib.error.HTTPError, pystow.utils.DownloadError):
             continue
         except pystow.utils.UnexpectedDirectoryError: