Update Rust crate tokio-util to 0.7.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
tokio-util (source)	dependencies	patch	0.7.3 -> 0.7.4

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Release Notes

tokio-rs/tokio

### [`v0.7.4`](https://togithub.com/tokio-rs/tokio/compare/tokio-util-0.7.3...tokio-util-0.7.4) [Compare Source](https://togithub.com/tokio-rs/tokio/compare/tokio-util-0.7.3...tokio-util-0.7.4)

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