unicode-emoji: 15.0 -> 15.1

[xtrm-en]

Description of changes

Updated to 15.1, fixes #310953

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/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 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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[iamcult]

According to a member of the Unicode staff, the test file that caused this breakage is 403 due to too many requests.

Emoji-test.txt is a test file that should not be needed for installed applications. There have been processes in the wild that apparently try downloading this file when their app is installed, and the hit traffic has been overwhelming our server.

It seems that 2 other packages in nixpkgs explicitly reference this test file, here and here.

Perhaps a better solution would be to remove the test file altogether, possibly switching those other two to pull from unicode individually.