fix(deps): update rust crate hyper-util to v0.1.8

[renovate]

This PR 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.60%. Comparing base (e906a41) to head (4686603).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   55.60%   55.60%           
=======================================
  Files          57       57           
  Lines       11462    11462           
=======================================
  Hits         6373     6373           
  Misses       5089     5089           

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