chore(dev): Update PostgreSQL 17.6 to 18.0 as default image

Signed-off-by: Thomas Vitale <ThomasVitale@users.noreply.github.com>

Author: ThomasVitale

arconia-dev/arconia-dev-services/arconia-dev-services-postgresql/src/main/java/io/arconia/dev/services/postgresql/PostgresqlDevServicesProperties.java

@@ -24,7 +24,7 @@ public class PostgresqlDevServicesProperties implements JdbcDevServicesPropertie
     /**
      * Full name of the container image used in the dev service.
      */
-    private String imageName = "postgres:17.6-alpine";
+    private String imageName = "postgres:18.0-alpine";
 
     /**
      * Environment variables to set in the service.