Update Rust crate hyper-util to v0.1.8

This MR contains the following updates:

Package	Type	Update	Change
hyper-util (source)	dependencies	patch	0.1.7 -> 0.1.8

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Release Notes

hyperium/hyper-util (hyper-util)

v0.1.8

Compare Source

• Add server::conn::auto::upgrade::downcast() for use with auto connection upgrades.

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