Bump tests/perf/s2n-quic from 5240fd6 to 73c9278 (#4419)

Bumps [tests/perf/s2n-quic](https://github.com/aws/s2n-quic) from
`5240fd6` to `73c9278`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/aws/s2n-quic/commit/73c9278697eba0614ed93dc96d5a8887eeeb1b9a"><code>73c9278</code></a>
tests: Include integ test Message representation in ring buffer tests
(<a
href="https://redirect.github.com/aws/s2n-quic/issues/2852">#2852</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/d50257705e6d5263ff2e0e3acbe3fc8d3f2f214e"><code>d502577</code></a>
feat(s2n-quic-dc): throttle repeated successful handshakes (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2845">#2845</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/651876cf06f3329938d86728e9f1e58379c60f6e"><code>651876c</code></a>
chore: s2n-quic 1.68.0 release (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2853">#2853</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/4bd8d3fa1f4f8c70801365a2cb7243057aa1dad3"><code>4bd8d3f</code></a>
ci(dhat): upload dhat artifacts regardless of steps outcome (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2850">#2850</a>)</li>
<li><a
href="https://github.com/aws/s2n-quic/commit/df20953ef1d5234dd3da5a29c89c81ea720a0a97"><code>df20953</code></a>
chore: scope permissions down for one GHA (<a
href="https://redirect.github.com/aws/s2n-quic/issues/2849">#2849</a>)</li>
<li>See full diff in <a
href="https://github.com/aws/s2n-quic/compare/5240fd629267cf640b4d9fa2201fd6d6e37ad5e0...73c9278697eba0614ed93dc96d5a8887eeeb1b9a">compare
view</a></li>
</ul>
</details>
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