Bump libp2p-identity from 0.2.8 to 0.2.9 (paritytech#5232)

Bumps [libp2p-identity](https://github.com/libp2p/rust-libp2p) from
0.2.8 to 0.2.9.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/libp2p/rust-libp2p/releases">libp2p-identity's
releases</a>.</em></p>
<blockquote>
<h2>libp2p-v0.53.2</h2>
<p>See individual <a
href="https://github.com/libp2p/rust-libp2p/blob/HEAD/CHANGELOG.md">changelogs</a>
for details.</p>
<h2>libp2p-v0.53.1</h2>
<p>See individual <a
href="https://github.com/libp2p/rust-libp2p/blob/HEAD/CHANGELOG.md">changelogs</a>
for details.</p>
<h2>libp2p-v0.53.0</h2>
<p>The most ergonomic version of rust-libp2p yet!</p>
<p>We've been busy again, with over <a
href="https://github.com/libp2p/rust-libp2p/compare/libp2p-v0.52.0...master">250</a>
PRs being merged into <code>master</code> since <code>v0.52.0</code>
(excluding dependency updates).</p>
<h2>Backwards-compatible features</h2>
<p>Numerous improvements landed as patch releases since the
<code>v0.52.0</code> release, for example a new, type-safe <a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4120"><code>SwarmBuilder</code></a>
that also encompasses the most common transport protocols:</p>
<pre lang="rust"><code>let mut swarm =
libp2p::SwarmBuilder::with_new_identity()
    .with_tokio()
    .with_tcp(
        tcp::Config::default().port_reuse(true).nodelay(true),
        noise::Config::new,
        yamux::Config::default,
    )?
    .with_quic()
    .with_dns()?
    .with_relay_client(noise::Config::new, yamux::Config::default)?
    .with_behaviour(|keypair, relay_client| Behaviour {
        relay_client,
        ping: ping::Behaviour::default(),
        dcutr: dcutr::Behaviour::new(keypair.public().to_peer_id()),
    })?
    .build();
</code></pre>
<p>The new builder makes heavy use of the type-system to guide you
towards a correct composition of all transports. For example, it is
important to compose the DNS transport as a wrapper around all other
transports but before the relay transport. Luckily, you no longer need
to worry about these details as the builder takes care of that for you!
Have a look yourself if you dare <a
href="https://github.com/libp2p/rust-libp2p/tree/master/libp2p/src/builder">here</a>
but be warned, the internals are a bit wild :)</p>
<p>Some more features that we were able to ship in <code>v0.52.X</code>
patch-releases include:</p>
<ul>
<li><a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4325">stable
QUIC implementation</a></li>
<li>for rust-libp2p compiled to WASM running in the browser
<ul>
<li><a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4015">WebTransport
support</a></li>
<li><a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4248">WebRTC
support</a></li>
</ul>
</li>
<li><a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4156">UPnP
implementation to automatically configure port-forwarding with ones
gateway</a></li>
<li><a
href="https://redirect.github.com/libp2p/rust-libp2p/pull/4281">option
to limit connections based on available memory</a></li>
</ul>
<p>We always try to ship as many features as possible in a
backwards-compatible way to get them to you faster. Often times, these
come with deprecations to give you a heads-up about what will change in
a future version. We advise updating to each intermediate version rather
than skipping directly to the most recent one, to avoid missing any
crucial deprecation warnings. We highly recommend you stay up-to-date
with the latest version to make upgrades as smooth as possible.</p>
<p>Some improvments we unfortunately cannot ship in a way that Rust
considers a non-breaking change but with every release, we attempt to
smoothen the way for future upgrades.</p>
<h2><code>#[non_exhaustive]</code> on key enums</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/libp2p/rust-libp2p/commits">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.toml

@@ -819,7 +819,7 @@ lazy_static = { version = "1.4.0" }
 libc = { version = "0.2.155" }
 libfuzzer-sys = { version = "0.4" }
 libp2p = { version = "0.52.4" }
-libp2p-identity = { version = "0.2.3" }
+libp2p-identity = { version = "0.2.9" }
 libsecp256k1 = { version = "0.7.0", default-features = false }
 linked-hash-map = { version = "0.5.4" }
 linked_hash_set = { version = "0.1.4" }