chore(deps): update dependency prometheus_postgres_exporter to v0.18.1-2

requirements.yml

@@ -55,7 +55,7 @@
   version: v1.9.1-12
   name: prometheus_node_exporter
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-prometheus-postgres-exporter.git
-  version: v0.18.1-1
+  version: v0.18.1-2
   name: prometheus_postgres_exporter
 - src: git+https://github.com/devture/com.devture.ansible.role.systemd_docker_base.git
   version: v1.4.1-0