coerce to list to dodge bug with interaction between gitpython and toolz (#10494)

Author: TomNicholas

ci/release_contributors.py

@@ -10,7 +10,7 @@
 def main():
     repo = git.Repo(".")
 
-    most_recent_release = last(repo.tags)
+    most_recent_release = last(list(repo.tags))
 
     # extract information from commits
     contributors = {}