Bump Fronter.NET from 0c2f645 to 81a66e5 (#1465)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`0c2f645` to `81a66e5`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/81a66e5e24d3157e78cdb519cdf4bb9ab72a3500"><code>81a66e5</code></a>
Use Meziantou.Analyzer (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/311">#311</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/0c2f645f6662afda080b4b2c9a48ccdd5d5f3e88...81a66e5e24d3157e78cdb519cdf4bb9ab72a3500">compare
view</a></li>
</ul>
</details>
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