Temporarily use a non-default branch of cisagov/ansible-role-automate…

…d-security-updates

This is being done for testing purposes and this change can be
reverted once cisagov/ansible-role-automated-security-updates#38 is
merged.

src/requirements.yml

@@ -6,6 +6,7 @@ roles:
     src: https://github.com/cisagov/ansible-role-amazon-ssm-agent
   - name: automated_security_updates
     src: https://github.com/cisagov/ansible-role-automated-security-updates
+    version: improvement/support-dnf5
   - name: banner
     src: https://github.com/cisagov/ansible-role-banner
   - name: cdm_nessus_agent