python3Packages.j2cli: disable on python 3.12

[sikmir]

Description of changes

$ nix run nixpkgs#j2cli -- -h
Traceback (most recent call last):
  File "/nix/store/mgizgbmlrz996i9rvpniga9mqbnkc6xz-python3.12-j2cli-0.3.10/bin/.j2-wrapped", line 6, in <module>
    from j2cli import main
  File "/nix/store/mgizgbmlrz996i9rvpniga9mqbnkc6xz-python3.12-j2cli-0.3.10/lib/python3.12/site-packages/j2cli/__init__.py", line 10, in <module>
    from j2cli.cli import main
  File "/nix/store/mgizgbmlrz996i9rvpniga9mqbnkc6xz-python3.12-j2cli-0.3.10/lib/python3.12/site-packages/j2cli/cli.py", line 8, in <module>
    import imp, inspect
ModuleNotFoundError: No module named 'imp'

kolypto/j2cli#80

Things done

• 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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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.

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[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/4233