Fix benchmarks

[jeffcharles]

Description of the change

Add plugin to CLI arguments when dynamically linking.

Why am I making this change?

I forgot to update the benchmarks when I changed dynamic linking to require a plugin.

It got noticed in #890 so I'm opting to fix this here separately.

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-plugin do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.