Bump once_cell from 1.18.0 to 1.19.0 (paritytech#3217)

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.18.0 to
1.19.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/matklad/once_cell/blob/master/CHANGELOG.md">once_cell's
changelog</a>.</em></p>
<blockquote>
<h2>1.19.0</h2>
<ul>
<li>Use <code>portable-atomic</code> instead of
<code>atomic-polyfill</code>, <a
href="https://redirect.github.com/matklad/once_cell/pull/251">#251</a>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/matklad/once_cell/commit/c48d3c2c01de926228aea2ac1d03672b4ce160c1"><code>c48d3c2</code></a>
Merge pull request <a
href="https://redirect.github.com/matklad/once_cell/issues/251">#251</a>
from taks/portable-atomic</li>
<li><a
href="https://github.com/matklad/once_cell/commit/8211d807891b9b1ccae3d83cafa582b6b73208a7"><code>8211d80</code></a>
Fix CI</li>
<li><a
href="https://github.com/matklad/once_cell/commit/2715aa9896ed6d0e810d350e6db4e0c5076a9df9"><code>2715aa9</code></a>
v1.19.0</li>
<li><a
href="https://github.com/matklad/once_cell/commit/dffcae4440f459184a345042a57dea26693b4c65"><code>dffcae4</code></a>
Fix CI</li>
<li><a
href="https://github.com/matklad/once_cell/commit/de4cd9db5362123997baa9b40a015024b67b65a3"><code>de4cd9d</code></a>
Revert atomic-polyfill feature</li>
<li><a
href="https://github.com/matklad/once_cell/commit/e26736f1f785f2c05f54d857b2876688f3fa5702"><code>e26736f</code></a>
Fix CI</li>
<li><a
href="https://github.com/matklad/once_cell/commit/5f88676dd00a6648578b74e1b018f4c944d0a93e"><code>5f88676</code></a>
Use portable_atomic instead of atomic-polyfill</li>
<li><a
href="https://github.com/matklad/once_cell/commit/874f9373abd7feaf923a3b3c34bfb3383529c671"><code>874f937</code></a>
clarify that MSRV does bump the minor version</li>
<li><a
href="https://github.com/matklad/once_cell/commit/3cd65494663f003b9b2e0be5b37b3426e543f72a"><code>3cd6549</code></a>
Merge <a
href="https://redirect.github.com/matklad/once_cell/issues/245">#245</a></li>
<li><a
href="https://github.com/matklad/once_cell/commit/a2eabc917bf4309bc9d492be92d892176da4ecf4"><code>a2eabc9</code></a>
Add <code>--generate-link-to-definition</code> option when building on
docs.rs</li>
<li>Additional commits viewable in <a
href="https://github.com/matklad/once_cell/compare/v1.18.0...v1.19.0">compare
view</a></li>
</ul>
</details>
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substrate/client/offchain/Cargo.toml

@@ -26,7 +26,7 @@ hyper = { version = "0.14.16", features = ["http2", "stream"] }
 hyper-rustls = { version = "0.24.0", features = ["http2"] }
 libp2p = "0.51.4"
 num_cpus = "1.13"
-once_cell = "1.8"
+once_cell = "1.19"
 parking_lot = "0.12.1"
 rand = "0.8.5"
 threadpool = "1.7"