Bump Fronter.NET from 69bf88f to 9880bca (#2991) #patch

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`69bf88f` to `9880bca`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/9880bcab96903f3822f86a5d9adc51525df58340"><code>9880bca</code></a>
Handle exit code -2147450730 from the backend (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/961">#961</a>)</li>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/c847514b5a00fc086bc04907e27a285caf5b5f83"><code>c847514</code></a>
Fix regex patterns to preserve underscores in converter changelog (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/960">#960</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/69bf88fee6470d97655b8f226b912ec056c095c8...9880bcab96903f3822f86a5d9adc51525df58340">compare
view</a></li>
</ul>
</details>
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