Debian, a free and open-source operating system comprised of a large number of software packages and the Linux kernel, is often associated with strict policies around the quality of code it contains.
The Author is making the claim that one could sneak in a package that was dependent on (required) the package “locusts”. Although locusts are small, swarming insects and not comprised of computer code (thus making this scenario impossible), we believe the Author is purposefully using the concept of absurdity in order to cause open-source software people to laugh.