Bump progenitor from 87749a1 to fb7a2d4 (#3122)

Bumps [progenitor](https://github.com/oxidecomputer/progenitor) from
`87749a1` to `fb7a2d4`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/oxidecomputer/progenitor/commit/fb7a2d4c7e90235c273177e1222ad5060cb09697"><code>fb7a2d4</code></a>
revert cargo.toml change</li>
<li><a
href="https://github.com/oxidecomputer/progenitor/commit/e7c4c16d9f874fe829857fe020c4933bee0ce493"><code>e7c4c16</code></a>
add special handling for optional query parameters (<a
href="https://redirect.github.com/oxidecomputer/progenitor/issues/468">#468</a>)</li>
<li><a
href="https://github.com/oxidecomputer/progenitor/commit/b94123e5ac5b11c4ff457bc160efb9650e67cc91"><code>b94123e</code></a>
httpmock patterns are too general (<a
href="https://redirect.github.com/oxidecomputer/progenitor/issues/467">#467</a>)</li>
<li>See full diff in <a
href="https://github.com/oxidecomputer/progenitor/compare/87749a11ee31f9d12e804727e291c70a830cc1af...fb7a2d4c7e90235c273177e1222ad5060cb09697">compare
view</a></li>
</ul>
</details>
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