Bump k256 from 0.13.3 to 0.13.4 (#5802)

Bumps [k256](https://github.com/RustCrypto/elliptic-curves) from 0.13.3
to 0.13.4.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/RustCrypto/elliptic-curves/commit/5ac8f5d77f11399ff48d87b0554935f6eddda342"><code>5ac8f5d</code></a>
k256 v0.13.4</li>
<li><a
href="https://github.com/RustCrypto/elliptic-curves/commit/613cbafd63763c579922ad2b79fa041b4a0dde50"><code>613cbaf</code></a>
k256: add support for non-32-byte BIP340 signatures (<a
href="https://redirect.github.com/RustCrypto/elliptic-curves/issues/1041">#1041</a>)</li>
<li><a
href="https://github.com/RustCrypto/elliptic-curves/commit/3787e4cd5b4223cae8bed05d087d6ff2f1d9430b"><code>3787e4c</code></a>
k256 v0.13.3</li>
<li>See full diff in <a
href="https://github.com/RustCrypto/elliptic-curves/compare/k256/v0.13.3...k256/v0.13.4">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.toml

@@ -817,7 +817,7 @@ jobserver = { version = "0.1.26" }
 jsonpath_lib = { version = "0.3" }
 jsonrpsee = { version = "0.24.3" }
 jsonrpsee-core = { version = "0.24.3" }
-k256 = { version = "0.13.3", default-features = false }
+k256 = { version = "0.13.4", default-features = false }
 kitchensink-runtime = { path = "substrate/bin/node/runtime" }
 kvdb = { version = "0.13.0" }
 kvdb-memorydb = { version = "0.13.0" }