⬆️ Update futures-core to v0.3.31

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
futures-core (source)	dependencies	patch	0.3.30 -> 0.3.31

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Release Notes

rust-lang/futures-rs (futures-core)

v0.3.31

Compare Source

• Fix use after free of task in FuturesUnordered when dropped future panics (#​2886)
• Fix soundness bug in task::waker_ref (#​2830)
  This is a breaking change but allowed because it is soundness bug fix.
• Fix bugs in AsyncBufRead::read_line and AsyncBufReadExt::lines (#​2884)
• Fix parsing issue in select!/select_biased! (#​2832)
  This is technically a breaking change as it will now reject a very odd undocumented syntax that was previously accidentally accepted.
• Work around issue due to upstream Waker::will_wake change (#​2865)
• Add stream::Iter::{get_ref,get_mut,into_inner} (#​2875)
• Add future::AlwaysReady (#​2825)
• Relax trait bound on non-constructor methods of io::{BufReader,BufWriter} (#​2848)

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