Update Rust crate tokio-util to 0.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio-util (source)	dependencies	minor	0.6 -> 0.7

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Release Notes

tokio-rs/tokio (tokio-util)

v0.7.16

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v0.7.15

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v0.7.14

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v0.7.13

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v0.7.12

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v0.7.11

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v0.7.10

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v0.7.9

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v0.7.8

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v0.7.7

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v0.7.6

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v0.7.5

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v0.7.4

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v0.7.3

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v0.7.2

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v0.7.1

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v0.7.0

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v0.6.10

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path Cargo.toml --package tokio-util@0.6.9 --precise 0.7.16
error: failed to acquire package cache lock

Caused by:
  failed to open: /home/ubuntu/.cargo/.package-cache

Caused by:
  failed to create directory `/home/ubuntu/.cargo`

Caused by:
  File exists (os error 17)