build(deps): Bump external/imgui-filebrowser from 60d4e09 to 980a444

Bumps [external/imgui-filebrowser](https://github.com/AirGuanZ/imgui-filebrowser) from `60d4e09` to `980a444`.
- [Commits](AirGuanZ/imgui-filebrowser@60d4e09...980a444)

---
updated-dependencies:
- dependency-name: external/imgui-filebrowser
  dependency-type: direct:production
...

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