Bump Fronter.NET from db76155 to fd7d5d9 (#2215)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`db76155` to `fd7d5d9`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/fd7d5d9d4c740a3aa413e00e013ba3612cec6b60"><code>fd7d5d9</code></a>
Fix the frontend displaying invalid timestamps</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/db7615594f0902965cc54ae0138a9b788322adbc...fd7d5d9d4c740a3aa413e00e013ba3612cec6b60">compare
view</a></li>
</ul>
</details>
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