Bump tests/perf/s2n-quic from 71f8d9f to f568f26 (rust-lang#3368)

Bumps [tests/perf/s2n-quic](https://github.com/aws/s2n-quic) from
`71f8d9f` to `f568f26`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/aws/s2n-quic/commit/f568f269ee5c9896f4936089c26dfbb3f87f4dab"><code>f568f26</code></a>
feat(s2n-quic-dc): return from ConfirmComplete when no dc version
negotiated ...</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/518c0a9d76b388c85e86f021165f06f641a9f91f"><code>518c0a9</code></a>
fix(s2n-quic-dc): reorder wire version to preserve wire invariants (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2277">#2277</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/59564ffbcce0c6d6a42af45b3587f49cb249d6ea"><code>59564ff</code></a>
feat(s2n-quic-dc): add ClientConfirm subscriber (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2274">#2274</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/fcd9a1b2c0e4b5c76726b291316161eec259792b"><code>fcd9a1b</code></a>
feat(s2n-quic-dc): import 7/18 version (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2275">#2275</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/2c95dd95c03ca85005c3f0e1fba33574d45012b3"><code>2c95dd9</code></a>
feat(s2n-quic-dc): Periodically re-handshake existing path secrets (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2276">#2276</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/d55d258ab4981a0318f3a84aa7872f45b502092a"><code>d55d258</code></a>
feat(s2n-quic-transport): Support de-duplicating concurrent connections
to th...</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/b3eb094898a1175dbc1213d4db3ff5a0d70931e0"><code>b3eb094</code></a>
fix(s2n-quic): implement Debug and Default for the disabled event
Subscriber ...</li>
<li>See full diff in <a
href="https://github.com/aws/s2n-quic/compare/71f8d9f5aafbf59f31ad85eeb7b4b67a7564a685...f568f269ee5c9896f4936089c26dfbb3f87f4dab">compare
view</a></li>
</ul>
</details>
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