fix(deps): update rust crate futures to 0.3.26

This MR contains the following updates:

Package	Type	Update	Change
futures (source)	dependencies	patch	0.3.25 -> 0.3.26

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Release Notes

rust-lang/futures-rs

v0.3.26

Compare Source

• Add Either::as_pin_mut and Either::as_pin_ref (#​2691)
• Add Shared::ptr_eq and Shared::ptr_hash (#​2691)
• Implement FusedStream for Buffered (#​2676)
• Implement FusedStream for all streams in ReadyChunks (#​2693)
• Fix bug in FuturesOrdered::push_front (#​2664)
• Remove Fut::Output: Clone bounds from some Shared methods (#​2662)
• Remove T: Debug bounds from Debug implementations of mpsc and oneshot types (#​2666, #​2667)

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