Bump Fronter.NET from 709e908 to 599df4d (#2340)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`709e908` to `599df4d`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/599df4dc8410b0163fa023a0fc949097fff85c4e"><code>599df4d</code></a>
Bump AWSSDK.S3 from 3.7.406.4 to 3.7.407.1 in /Fronter.NET (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/698">#698</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/709e908c97d0f6fbf59d36fe2bb304c3cb786c96...599df4dc8410b0163fa023a0fc949097fff85c4e">compare
view</a></li>
</ul>
</details>
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