Bump Fronter.NET from 9880bca to 123be79 (#2993) #patch

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`9880bca` to `123be79`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/123be7993cbc0935647ba5beca76a857be528e89"><code>123be79</code></a>
Bump ReactiveUI.Avalonia to 11.4.12 (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/963">#963</a>)</li>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/6a67345c18c73ae001dfdb9e9029fd2c981b8c67"><code>6a67345</code></a>
RadioSelector: use default option when selected value is invalid (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/962">#962</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/9880bcab96903f3822f86a5d9adc51525df58340...123be7993cbc0935647ba5beca76a857be528e89">compare
view</a></li>
</ul>
</details>
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