sage: remove optional jmol dep (and thus also jre8)

[amarshall]

We are now past Sage 10.5, and jmol is now optional so unneeded in the default env.

See sagemath/sage#31027

Things done

Tested basic CLI usage.

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review

---

x86_64-linux

✅ 4 packages built:

• cantor
• labplot
• sage
• sageWithDoc

---

Add a 👍 reaction to pull requests you find important.

[collares]

I'd say this is a good change, but honestly I don't use 3D plots in Sage. Still, I think the best course of action is to merge this and wait to see if someone misses the functionality provided by Jmol.