Remove enforcing linting status check (#4)

@p-j-smith expressed concern about this in
UCL-MIRSG/.github#47 (review)

Turns out this is what happens for a repo that doesn't have the status
check, so probably makes sense to remove

![image](https://github.com/UCL-MIRSG/admin/assets/15052188/9141141f-fb31-438a-9641-64a59daf6bfb)

.github/settings.yml

@@ -126,8 +126,7 @@ branches:
           teams: []
       required_status_checks:
         strict: true
-        contexts:
-          - linting
+        contexts: []
       enforce_admins: true
       restrictions:
         apps: []