Bump extern/grackle_data_files from 83c2929 to 9286964 (#760)

Bumps
[extern/grackle_data_files](https://github.com/grackle-project/grackle_data_files)
from `83c2929` to `9286964`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/928696482fbe15d9bac4382de6134d95568f099c"><code>9286964</code></a>
Merge pull request <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/11">#11</a>
from brittonsmith/update</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/737009c1566bb72d0c53f02fe0d4ca7c063673ae"><code>737009c</code></a>
Remove rate coefficients testing file after transitioning test to gold
standa...</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/7499abbc6c7e4b9d629d55d9f21b1c8166529b75"><code>7499abb</code></a>
Merge pull request <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/10">#10</a>
from brittonsmith/gtest</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/ddcc68a1fac1af7d18f3d56b0ea8e3f3dd0b4022"><code>ddcc68a</code></a>
Remove obsolete testing answer files.</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/9a63dbefeb1410483df0071eefcbff666f40816d"><code>9a63dbe</code></a>
Merge pull request <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/9">#9</a>
from brittonsmith/issue6</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/ee5ff1c6eee544d76ce26b5dcfc6b4ac795bea9f"><code>ee5ff1c</code></a>
Add missing redshift dataset to cooling table.</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/5d73d81c657a9f0795b1058774eccc49787e2f62"><code>5d73d81</code></a>
Merge pull request <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/8">#8</a>
from brittonsmith/PR126</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/9084536dbffff9ce2f1fd347c083a632062797a8"><code>9084536</code></a>
Update answers for PR <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/126">#126</a>.</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/31ec9d72b8c6dfee76b7dd79b0b3581241278e6e"><code>31ec9d7</code></a>
Merge pull request <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/5">#5</a>
from brittonsmith/PR97</li>
<li><a
href="https://github.com/grackle-project/grackle_data_files/commit/9b4ab633bbae44a65def0741ab8d6bb8a172e30e"><code>9b4ab63</code></a>
Update answers for PR <a
href="https://redirect.github.com/grackle-project/grackle_data_files/issues/97">#97</a>.</li>
<li>See full diff in <a
href="https://github.com/grackle-project/grackle_data_files/compare/83c2929b719d30d3269b36af35e3ef5c59c46a76...928696482fbe15d9bac4382de6134d95568f099c">compare
view</a></li>
</ul>
</details>
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