As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
<groupId>io.jenkins.plugins</groupId>
<artifactId>horreum</artifactId>
<version>0.16.162.v33b_4a_a_b_5f828</version>
</dependency>