Bump Fronter from 4fdfdeb to fe21081

Bumps [Fronter](https://github.com/ParadoxGameConverters/Fronter) from `4fdfdeb` to `fe21081`.
- [Commits](ParadoxGameConverters/Fronter@4fdfdeb...fe21081)

---
updated-dependencies:
- dependency-name: Fronter
  dependency-version: fe21081b837ea08c2ca22b22177d166e4c163ffb
  dependency-type: direct:production
...

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Author: dependabot[bot]