fix(bios): add libretro-uae4arm in bios list

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Please make sure your Merge Request is ready to be merged:

• a line describing your modifications has been added to CHANGELOG.md
• a line describing tests to make before release has been added to TESTING.md
• if the Merge Request is about a new feature, an improvement or an important bugfix, amend RELEASE-NOTES.md
• you respected conventional commits

The results of the build can give you clues about what is missing in your Merge Request.

Changes :

• Added libretro-uae4arm in bios list following https://github.com/Chips-fr/uae4arm-rpi/blob/master/README.md

Related to #1771 (closed)