automation: Update docker-matrix_database Docker tag to v16 - autoclosed

This MR contains the following updates:

Package	Update	Change
docker-matrix_database	major	15.8 -> 16.4

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This MR has been generated by Renovate Bot.

roles/docker_matrix/defaults/main.yml

@@ -28,7 +28,7 @@ docker_matrix_synapse_servername: example.com
 docker_matrix_synapse_domain: "{{ docker_matrix_synapse_servername }}"
 docker_matrix_synapse_options: []
 # renovate: depName=docker.io/library/postgres
-docker_matrix_database_version: "15.8"
+docker_matrix_database_version: "16.4"
 docker_matrix_database_password: "{{ lookup('passwordstore', docker_matrix_synapse_domain + '/db create=true length=42') }}"
 
 docker_matrix_riotweb_domain: riot.example.com