Upstream has moved to python3 in commit 8e2f442e[1]. This should be just a matter of updating the packaging and dependencies, but I'm not familiar with the package itself (although I'm a regular user of gnumeric). I'd be willing to help if needed.
[1] https://gitlab.gnome.org/GNOME/gnumeric/-/commit/8e2f442e88a82f3a639f7b0ee5cd8760db20b172 []'s, Francisco
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