Bump tokio-util from 0.7.8 to 0.7.9 (#2159)

Bumps [tokio-util](https://github.com/tokio-rs/tokio) from 0.7.8 to
0.7.9.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tokio-rs/tokio/commit/3f6165d82e7615cb78639112520d7de76f8a0a14"><code>3f6165d</code></a>
chore: prepare tokio-util v0.7.9 (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/6019">#6019</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/ad7f988da377c365cacb5ca24d044a9be5de5889"><code>ad7f988</code></a>
sync: fix <code>mark_changed</code> when version overflows (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/6017">#6017</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/9d51b76d017cfef12e053760fa31f0845c214e3a"><code>9d51b76</code></a>
sync: add <code>watch::Sender::new</code> (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5998">#5998</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/804511822b4be12a958d01fe1156b0a71bc8e6f7"><code>8045118</code></a>
sync: rename <code>watch::mark_unseen</code> to
<code>watch::mark_changed</code> (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/6014">#6014</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/e6553c4ee3c5914cba885a6498451fcd0de3e506"><code>e6553c4</code></a>
sync: add Semaphore example using an <code>Arc\&lt;Semaphore&gt;</code>
(<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5956">#5956</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/d247e7f5df4bd861287467ecc5f827538bee4d63"><code>d247e7f</code></a>
sync: document that <code>const_new()</code> is not instrumented (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/6002">#6002</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/65e7715909694d8d7d15b081cc3790b4ea1ad300"><code>65e7715</code></a>
util: replace <code>sync::reusable_box::Pending</code> with
<code>std::future::Pending</code> (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/6000">#6000</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/61042b4d90fa737dcf922e01466ded812c0f1a03"><code>61042b4</code></a>
sync: add <code>watch::Receiver::mark_unseen</code> (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5962">#5962</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/1c428cc558bd3be71fcd9466010b2ff0ed4048b6"><code>1c428cc</code></a>
tokio: fix cache line size for RISC-V (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5994">#5994</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/61f095fdc136f3e2a547d09b60a3ce1ef598b1f7"><code>61f095f</code></a>
sync: add <code>?Sized</code> bound to
<code>{MutexGuard,OwnedMutexGuard}::map</code> (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5997">#5997</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/tokio-rs/tokio/compare/tokio-util-0.7.8...tokio-util-0.7.9">compare
view</a></li>
</ul>
</details>
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