ci(Mergify): configuration update

Signed-off-by: twisti <null>

Author: twisti-dev

.mergify.yml

@@ -1,12 +1,14 @@
 pull_request_rules:
-  - name: Add a queue label when PR is queued
-    description: Toggle the queue label when a pull request is (un)queued.
+  - name: "Close PRs opened from master"
     conditions:
-      - queue-position > 0
+      - author!=mergify[bot]
+      - base!=master
+      - head=master
     actions:
-      label:
-        toggle:
-          - merge-queued
+      comment:
+        message: >
+          🚫 Pull requests must not be created by the `master` branch. Please use a feature branch.
+      close: {}
   - name: Label Mergify Stacks PRs
     description: Pull requests that are part of a Mergify stack should be labeled as such
     conditions: