MINOR: [Dev] Add Ben Harkins to collaborators (#33632)

This should allow assigning issues, if I read https://cwiki.apache.org/confluence/display/INFRA/Git+-+.asf.yaml+features correctly.

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>

.asf.yaml

@@ -20,6 +20,7 @@ github:
   homepage: https://arrow.apache.org/
   collaborators:
     - assignUser
+    - benibus
     - milesgranger
     - toddfarmer