Update mirror.grid.uchicago.edu.yml for almalinux-kitten (#1124)

* Update mirror.grid.uchicago.edu.yml for almalinux-kitten

* Fix syntax

---------

Co-authored-by: Jonathan Wright <jonathan@almalinux.org>

mirrors.d/mirror.grid.uchicago.edu.yml

@@ -4,6 +4,11 @@ address:
   http: http://mirror.grid.uchicago.edu/pub/linux/alma/
   https: https://mirror.grid.uchicago.edu/pub/linux/alma/
   rsync: rsync://mirror.grid.uchicago.edu/alma
+address_optional:
+  kitten:
+    http: http://mirror.grid.uchicago.edu/pub/linux/almalinux-kitten
+    https: http://mirror.grid.uchicago.edu/pub/linux/almalinux-kitten
+    rsync: rsync://mirror.grid.uchicago.edu/almalinux-kitten
 geolocation:
   country: US
   state_province: IL
@@ -12,4 +17,4 @@ update_frequency: 6h
 sponsor: University of Chicago - MANIAC Lab
 sponsor_url: https://maniaclab.uchicago.edu/
 email: maniaclab-ops@lists.uchicago.edu
-...
+...