Bump Fronter.NET from 2a155b8 to 855e066 (#1665) #patch

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`2a155b8` to `855e066`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/855e0666eb6cd89c9c56be5f49942802d73e7b32"><code>855e066</code></a>
Catch installer download failure and show a notification (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/423">#423</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/2a155b84856e17037c84c8f44723582444070c93...855e0666eb6cd89c9c56be5f49942802d73e7b32">compare
view</a></li>
</ul>
</details>
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