chore: migrate target/artifacts to release_artifacts to avoid cargo clean loss

[YOU54F]

in order to avoid glibc errors when compiling, it is necessary to run cargo clean prior to cross build as per solution 2 in this cross-rs issue

In doing so, it deletes the created target/artifacts folder.

We can either

1. move release artifacts out of the target/artifacts folder
2. use cargo clean -p <libname> --release which should in theory only delete the release artifacts for a particular target but I've not tested out if this works

I've elected for option 1