Update request: gegl 0.4.46 → 0.4.48

[9p4]

• Package name: gegl
• Latest released version: 0.4.48
• Current version on the unstable channel: 0.4.46
• Current version on the stable/release channel: 0.4.46
• [x] Checked the nixpkgs pull requests

Notify maintainers

@jtojnar

I can take over the package if you wish.

---

Note for maintainers: Please tag this issue in your PR.

---

Add a :+1: reaction to issues you find important.

[jtojnar]

If you are able to bump the package (and babl), feel free. I probably will not be able to get to it this week.