Update code-submitter mostly for security updates

This picks up updates to the code-submitter requirements for a few
security updates as well as an improvement to the error message
when the auth file is empty. As the latter is now slightly stricter
we also update the initial content of the file.

roles/code-submitter/tasks/main.yml

@@ -16,7 +16,7 @@
     repo: https://github.com/PeterJCLaw/code-submitter
     dest: "{{ install_dir }}"
     force: true
-    version: 68c60c030d361f50d415f4e89a87b673a4ef5e4f
+    version: a9565062242dc07294d69a3fb90871202fd753bd
   notify:
     Restart code-submitter
   register: code_submitter_repo
@@ -43,7 +43,7 @@
 
 - name: Create credentials
   copy:
-    content: ""
+    content: "{}"
     dest: "{{ secrets_dir }}/code-submitter-credentials.yaml"
     owner: www-data
     force: false