build(rust): Update features for latest flate2 release

[ritchie46]

fix for latest flate2 release

[stinodego]

I'm merging this because I want the lockfile in the main branch 😬

[lorepozo]

It looks like this change makes decompress-fast redundant — it's the same as decompress. There are these lines further down polars-io/Cargo.toml:

decompress = ["flate2/miniz_oxide"]
decompress-fast = ["flate2/zlib-ng"]

But with this change, the zlib-ng feature is always present for flate2's dependency, and zlib-ng "wins" over miniz_oxide when both are set. See the "wins" behavior here: https://github.com/rust-lang/flate2-rs/blob/main/src/ffi/mod.rs#L37

And these two features are always checked together, like so:

#[cfg(any(feature = "decompress", feature = "decompress-fast"))]
pub(crate) fn decompress(...)