remove `openssl`

[clux]

For a multitude of reasons;

• It's EOL and unsupported since september 2023. we only ever made openssl 1 work.
• am personally not using it anymore and do not plan on returning to it (kube is changed to rustls by default and rustls has multiple providers - the main two both work on muslrust)
• openssl 3 performance is also not great

Obviously this is a breaking change, but pretending we are providing a safe thing here by including it is also not great.

I would rather have a workable build container, than one that sneaks in unsafe versions into my tools by default.

[clux]

fyi

• emk abandoned their image due to ssl/pq; https://github.com/emk/rust-musl-builder
• goldranks variant also abandoned; https://gitlab.com/rust_musl_docker/image