fix(deps): update rust crate tokio to 1.21.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio (source)	dependencies	patch	1.21.1 -> 1.21.2

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Configuration

📅 Schedule: Branch creation - "before 3am on Monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

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

---

• If you want to rebase/retry this PR, click this checkbox. ⚠ Warning: custom changes will be lost.

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This PR has been generated by Mend Renovate. View repository job log here.

[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: src/functions-templates/rust/hello-world/Cargo.lock

Command failed: docker run --rm --name=renovate_rust --label=renovate_child -v "/mnt/renovate/gh/netlify/cli":"/mnt/renovate/gh/netlify/cli" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -v "/tmp/containerbase":"/tmp/containerbase" -e BUILDPACK_CACHE_DIR -e CONTAINERBASE_CACHE_DIR -w "/mnt/renovate/gh/netlify/cli" docker.io/renovate/rust bash -l -c "cargo update --manifest-path src/functions-templates/rust/hello-world/Cargo.toml --workspace"
error: failed to parse manifest at `/mnt/renovate/gh/netlify/cli/src/functions-templates/rust/hello-world/Cargo.toml`

Caused by:
  invalid character `{` in package name: `{{name}}`, the first character must be a Unicode XID start character (most letters or `_`)

[github-actions]

📊 Benchmark results

Comparing with d35a400

Package size: 223 MB

(no change)

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