Bump Fronter.NET from 2966a15 to 81f61d6 (#2658)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`2966a15` to `81f61d6`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/81f61d69109ba294e50793a561c752bd311200c3"><code>81f61d6</code></a>
Bump Updater from <code>2081d44</code> to <code>c031826</code> (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/895">#895</a>)</li>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/6b888925d3e64a52fa02ffad3918ae97e991d410"><code>6b88892</code></a>
Bump Microsoft.EntityFrameworkCore.Design and 3 others (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/896">#896</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/2966a15c71b81e312f316864f64d9349c6bcea5b...81f61d69109ba294e50793a561c752bd311200c3">compare
view</a></li>
</ul>
</details>
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