fix(self-zizmor): run on any change

Since this is used as a org-wide required action, we have to run it on
any change to the underlying repository.

Author: zerok

.github/workflows/self-zizmor.yaml

@@ -1,17 +1,13 @@
 name: zizmor GitHub Actions static analysis
 on:
   push:
-    paths:
-      - ".github/**"
   pull_request:
     types:
       - edited
       - opened
       - ready_for_review
       - synchronize
       - reopened
-    paths:
-      - ".github/**"
   merge_group:
     types: [checks_requested]
 jobs: