Update release checklist [ci skip]

.gitlab/issue_templates/Create a Release.md

@@ -19,7 +19,7 @@
 6.  [ ] The [Flower monitor](https://emfollow-playground.ligo.caltech.edu/flower) is reachable and shows no unexpected task failures.
 7.  [ ] The [Flask dashboard](https://emfollow-playground.ligo.caltech.edu/gwcelery) is reachable.
 8.  [ ] The playground deployment is connected to LVAlert (in Flower, find the main gwcelery-worker, click Other, and look at the list of subscribed LVAlert nodes).
-9.  [ ] The playground deployment is connected to GCN (receiving only).
+9.  [ ] The playground deployment is connected to GCN.
 
 ## Mock events