Update guest request issue template

Author: AndreaGriffiths11

.github/ISSUE_TEMPLATE/osf-guest-invite.yml

@@ -2,7 +2,6 @@ name: Open Source Friday Guest Request
 description: Complete this form to request to be a guest on Open Source Friday
 title: Open Source Friday - [PROJECT NAME] - [MM-DD-YYYY]
 labels: ["open-source-friday", "open-source", "twitch", "pending"]
-assignees: ["AndreaGriffiths11"]
 
 body:
   - type: markdown