Bump io.micronaut.platform:micronaut-parent from 5.0.3 to 5.0.4 in /labs/unicorn-store/software/alternatives/unicorn-store-micronaut

Bump io.micronaut.platform:micronaut-parent from 5.0.3 to 5.0.4 in /labs/unicorn-store/software/alternatives/unicorn-store-micronaut #1271