Docs.rs build failing due to missing libcamera dependency

[chemicstry]

Log: https://docs.rs/crate/libcamera/0.2.1/builds/747463

Fixing: https://forge.rust-lang.org/docs-rs/add-dependencies.html

Ubuntu 22.04 libcamera package rev git20200629+e7aa92a-9 might be too old to build. Needs investigation.