Remove newlines from dependencies to fix Python sdist

[xhochy]

Fixes #10366

[stinodego]

Thanks for the patch - but how does this fix the issue? How have you verified this?

Sounds to me like this is a bug in maturin that should be reported there (although we can accept a temporary patch of course).

[xhochy]

Yes, sadly this fixes it. I have verified this using maturin sdist -m py-polars/Cargo.toml and then pip installing the resulting sdist.

[xhochy]

I can make an issue with maturin in the coming days.

[ritchie46]

I shall open an issue, pointing to this fix.

[ritchie46]

See: PyO3/maturin#1732

[messense]

See also toml-rs/toml#594

[xhochy]

I'm happy to fix the lint issues and the merge conflicts if there is interest in merging this.

[stinodego]

I think @messense just released a patch version of maturin that should solve the issue - I'll set our minimum version to 1.2.1. So this PR can be closed.

Thanks @xhochy for your help in finding this issue!