remove print statement, add github check for it

.github/workflows/print.yml

@@ -0,0 +1,19 @@
+name: Check for print statements
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  print:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Grep for print
+      run: |
+        ! grep -E 'print *\(' -r intelmq/ intelmq_certbund_contact/*.py

intelmq_certbund_contact/rulesupport.py

@@ -336,7 +336,6 @@ def as_dict_for_event(self, event):
         aggregate_identifier = self.aggregate_key.copy()
         for field in self.aggregate_fields:
             aggregate_identifier[field] = event.get(field)
-        print('as_dict_for_event, aggregate_identifier', aggregate_identifier, )
 
         return dict(medium=self.medium,
                     recipient_address=self.recipient_address,