Bump Fronter.NET from bec73c9 to 6e86d0f (#1143) #patch

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`bec73c9` to `6e86d0f`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/6e86d0f12828d3daa41eb316dcf2d6218a112eed"><code>6e86d0f</code></a>
Boost converter backend (<a
href="https://github-redirect.dependabot.com/ParadoxGameConverters/Fronter.NET/issues/176">#176</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/bec73c953accb3713b08923789bda577289ba3b3...6e86d0f12828d3daa41eb316dcf2d6218a112eed">compare
view</a></li>
</ul>
</details>
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