Merge #510

510: Bump tokio-util from 0.6.6 to 0.6.7 r=thomaseizinger a=dependabot[bot]

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.6.6 to 0.6.7.
<details>
<summary>Commits</summary>
<ul>
<li><a href="deb1f98125"><code>deb1f98</code></a> chore: prepare tokio-util v0.6.7 (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3784">#3784</a>)</li>
<li><a href="3a659c47c3"><code>3a659c4</code></a> chore: prepare tokio-mcaros v1.2.0 (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3783">#3783</a>)</li>
<li><a href="580dc9594c"><code>580dc95</code></a> chore: prepare Tokio v1.6.0 (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3782">#3782</a>)</li>
<li><a href="8c395dfe61"><code>8c395df</code></a> io: impl AsyncSeek for BufReader/BufWriter/BufStream (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3491">#3491</a>)</li>
<li><a href="e188e99ca3"><code>e188e99</code></a> process: avoid redundant effort to reap orphan processes (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3743">#3743</a>)</li>
<li><a href="0b93bd511d"><code>0b93bd5</code></a> net: support non-blocking vectored I/O (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3761">#3761</a>)</li>
<li><a href="d846bf24b1"><code>d846bf2</code></a> sync: Barrier doc should use task, not thread (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3780">#3780</a>)</li>
<li><a href="9ff7d8c352"><code>9ff7d8c</code></a> net: hide net::unix::datagram module from docs (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3775">#3775</a>)</li>
<li><a href="8324317005"><code>8324317</code></a> doc: fix doc-cfg on io::duplex, io::copy_bidirectional, and task::unconstrain...</li>
<li><a href="7207e3ca43"><code>7207e3c</code></a> signal: use std::os::raw::c_int instead of libc::c_int on public API (<a href="https://github-redirect.dependabot.com/tokio-rs/tokio/issues/3774">#3774</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/tokio-rs/tokio/compare/tokio-util-0.6.6...tokio-util-0.6.7">compare view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -4189,9 +4189,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.6.6"
+version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "940a12c99365c31ea8dd9ba04ec1be183ffe4920102bb7122c2f515437601e8e"
+checksum = "1caa0b0c8d94a049db56b5acf8cba99dc0623aab1b26d5b5f5e2d945846b3592"
 dependencies = [
  "bytes 1.0.1",
  "futures-core",