Bump Fronter.NET from 554508f to b5eb3e8 (#1740)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`554508f` to `b5eb3e8`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/b5eb3e83c22522c550d53818b57be05bee7307b1"><code>b5eb3e8</code></a>
Bump Meziantou.Analyzer from 2.0.138 to 2.0.139 (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/456">#456</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/554508f2bb53c4005c70c76d80763d3fb5ec98c2...b5eb3e83c22522c550d53818b57be05bee7307b1">compare
view</a></li>
</ul>
</details>
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