Bump tests/perf/s2n-quic from 4c3ba69 to c84ba19 (#3736)

Bumps [tests/perf/s2n-quic](https://github.com/aws/s2n-quic) from
`4c3ba69` to `c84ba19`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/aws/s2n-quic/commit/c84ba19d2688b7026a23027553f684ad3b10552f"><code>c84ba19</code></a>
feat(s2n-quic-dc): implement cache events (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2386">#2386</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/23df2c5d30919a5dc665ac1317c7d7539fe4acce"><code>23df2c5</code></a>
chore: release 1.51.0 (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2384">#2384</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/d8fe405a7f10203bb9834e5c2c9ab7c12f0ce872"><code>d8fe405</code></a>
feat(s2n-quic): improve local handshake failure visibility (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2383">#2383</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/c0758305e8609718f2973c6c0591990d42f58fa0"><code>c075830</code></a>
feat(s2n-quic-dc): metric for forward gaps in key ID tracking (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2382">#2382</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/6c3874efd6fbce84e813172e08ce8fbb466663e6"><code>6c3874e</code></a>
test(s2n-quic-dc): add send tests and benchmarks (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2380">#2380</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/59aef1f2973123d09fb4576bf01434274f975314"><code>59aef1f</code></a>
feat(s2n-quic-dc): record gap for accepted packets (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2381">#2381</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/02ed7da084d6d87758cecee3ef139e1322e0717f"><code>02ed7da</code></a>
feat(s2n-quic-dc): add acceptor events (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2379">#2379</a>)</li>
<li>See full diff in <a
href="https://github.com/aws/s2n-quic/compare/4c3ba69e3d71d0a2d7aaf58a4be3dd3c6bceb96b...c84ba19d2688b7026a23027553f684ad3b10552f">compare
view</a></li>
</ul>
</details>
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