Bump dropshot from fc0ffd5 to 31f7ab9 (#3426)

Bumps [dropshot](https://github.com/oxidecomputer/dropshot) from
`fc0ffd5` to `31f7ab9`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/oxidecomputer/dropshot/commit/31f7ab94596b135ce761b1480413b753bdb29d1c"><code>31f7ab9</code></a>
Bump rustls from 0.21.1 to 0.21.2 (<a
href="https://redirect.github.com/oxidecomputer/dropshot/issues/706">#706</a>)</li>
<li><a
href="https://github.com/oxidecomputer/dropshot/commit/94862488a6def81731ca477a6f7ed84fcb5d2230"><code>9486248</code></a>
Bump tokio-rustls from 0.24.0 to 0.24.1 (<a
href="https://redirect.github.com/oxidecomputer/dropshot/issues/707">#707</a>)</li>
<li><a
href="https://github.com/oxidecomputer/dropshot/commit/7843f25a21d92bcd5a034fe29bd6e99a479a1396"><code>7843f25</code></a>
Bump rcgen from 0.10.0 to 0.11.1 (<a
href="https://redirect.github.com/oxidecomputer/dropshot/issues/708">#708</a>)</li>
<li><a
href="https://github.com/oxidecomputer/dropshot/commit/c27166dd44166941b0e887942286fd74799e8d83"><code>c27166d</code></a>
Bump serde_json from 1.0.96 to 1.0.97 (<a
href="https://redirect.github.com/oxidecomputer/dropshot/issues/705">#705</a>)</li>
<li><a
href="https://github.com/oxidecomputer/dropshot/commit/b754b2df8104b3b3558596ef82b9ea3e3546367a"><code>b754b2d</code></a>
Bump uuid from 1.3.3 to 1.3.4 (<a
href="https://redirect.github.com/oxidecomputer/dropshot/issues/704">#704</a>)</li>
<li>See full diff in <a
href="https://github.com/oxidecomputer/dropshot/compare/fc0ffd522a78f9296f855bdf4c2703f900dfe99e...31f7ab94596b135ce761b1480413b753bdb29d1c">compare
view</a></li>
</ul>
</details>
<br />


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