fix(deps): update rust crate futures to 0.3.25

This MR contains the following updates:

Package	Type	Update	Change
futures (source)	dependencies	patch	0.3.24 -> 0.3.25

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Release Notes

rust-lang/futures-rs

v0.3.25

Compare Source

• Fix soundness issue in join! and try_join! macros (#​2649)
• Implement Clone for sink::Drain (#​2650)

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