jobs/update-osmo-*: change mail recipients

Use jenkins-notifications@lists.osmocom.org like in most other jobs to
not clutter the other ML.

Change-Id: I95c22215dbe09d06d9458a980d15370440f67fd6

jobs/update-osmo-ci-on-slaves.yml

@@ -43,7 +43,7 @@
 
     publishers:
       - email:
-          recipients: intern@lists.sysmocom.de
+          recipients: jenkins-notifications@lists.osmocom.org
 
 # Trigger from docker-playground.git too
 - job:

jobs/update-osmo-python-on-slaves.yml

@@ -40,6 +40,6 @@
            project: update-osmo-ci-on-slaves
            threshold: FAILURE
        - email:
-           recipients: intern@lists.sysmocom.de
+           recipients: jenkins-notifications@lists.osmocom.org
 
 # vim: expandtab tabstop=2 shiftwidth=2