Update Rust crate futures to 0.3.28 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
futures (source)	dependencies	patch	0.3.27 -> 0.3.28

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Release Notes

rust-lang/futures-rs

### [`v0.3.28`](https://togithub.com/rust-lang/futures-rs/blob/HEAD/CHANGELOG.md#​0328---2023-03-30) [Compare Source](https://togithub.com/rust-lang/futures-rs/compare/0.3.27...0.3.28) - Update to syn 2. This raises MSRV of utility crates to 1.56. ([#​2730](https://togithub.com/rust-lang/futures-rs/issues/2730), [#​2733](https://togithub.com/rust-lang/futures-rs/issues/2733)) - Fix bug in `FlattenUnordered` ([#​2726](https://togithub.com/rust-lang/futures-rs/issues/2726), [#​2728](https://togithub.com/rust-lang/futures-rs/issues/2728))

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