openqa/dispatcher: install resultsdb_conventions

I thought/assumed/knew/something? that resultsdb_conventions_fedora
required resultsdb_conventions, but right now it seems it doesn't.
It *should*, but I can't fix it right now as the buildsystem is
down, so let's just install it here...

Signed-off-by: Adam Williamson <awilliam@redhat.com>

roles/openqa/dispatcher/tasks/main.yml

@@ -176,8 +176,8 @@
 - name: Install required packages
   ansible.builtin.package:
     name: ['fedora-messaging', 'python3-fedfind', 'python3-wikitcms', 'python3-openqa_client',
-           'python3-requests', 'python3-resultsdb_api', 'python3-resultsdb_conventions-fedora',
-           'python3-six', 'python3-pip']
+           'python3-requests', 'python3-resultsdb_api', 'python3-resultsdb_conventions',
+           'python3-resultsdb_conventions-fedora', 'python3-six', 'python3-pip']
     state: present
   tags:
   - packages