Bump Fronter.NET from af29ed3 to 20c6d1e (#3081)

Bumps
[Fronter.NET](https://github.com/ParadoxGameConverters/Fronter.NET) from
`af29ed3` to `20c6d1e`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/20c6d1ec68273f37cb783d137d30966b50888644"><code>20c6d1e</code></a>
&quot;Follow System&quot; theme option (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/969">#969</a>)</li>
<li><a
href="https://github.com/ParadoxGameConverters/Fronter.NET/commit/a0011b4f3d957d98c6e0c88a5ce5ddc0b348401d"><code>a0011b4</code></a>
Bump Avalonia to 11.3.14 (<a
href="https://redirect.github.com/ParadoxGameConverters/Fronter.NET/issues/968">#968</a>)</li>
<li>See full diff in <a
href="https://github.com/ParadoxGameConverters/Fronter.NET/compare/af29ed38c045443b6d5fb19560e69227d5bd290d...20c6d1ec68273f37cb783d137d30966b50888644">compare
view</a></li>
</ul>
</details>
<br />


Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]