Bump ext/flecs from d24a9e1 to f9c7c3d

Bumps [ext/flecs](https://github.com/SanderMertens/flecs) from `d24a9e1` to `f9c7c3d`.
- [Release notes](https://github.com/SanderMertens/flecs/releases)
- [Commits](SanderMertens/flecs@d24a9e1...f9c7c3d)

---
updated-dependencies:
- dependency-name: ext/flecs
  dependency-type: direct:production
...

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