Follow redirects on HEAD requests to ROR

Co-authored-by: Matyas Selmeci <matyas@cs.wisc.edu>

Author: mwestphall

institutions-api/util/ror_utils.py

@@ -7,5 +7,5 @@
 def validate_ror_id(ror_id: Optional[str]):
     """ Check whether an ROR ID is valid by performing a HEAD request to ror.org """
     # TODO we might want to rate-limit this in some way
-    if ror_id and requests.head(ror_id).status_code != 200:
+    if ror_id and requests.head(ror_id, allow_redirects=True).status_code != 200:
         raise HTTPException(400, f"Invalid ROR ID: institution does not exist. See {ROR_ID_PREFIX}.")