github-linguist: fix gem extension build warnings

[abiriadev]

Let github-linguist use Ruby 3.4, in order to fix #425375.

See also #416427 and #400243.

No breaking changes. version and Gemfile.lock & gemset.nix will be preserved.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[abiriadev]

To test:

nix run github:nixos/nixpkgs/1277ecfcaa8e6e2226d417781f443c8f6deaf55b#github-linguist -- --help

It shouldn't print any warnings for missing extensions.

Linguist v9.1.0
Detect language type and determine language breakdown for a given Git repository.

Usage: linguist <path>
       linguist <path> [--rev REV] [--tree-size] [--breakdown] [--json]
       linguist [--rev REV] [--tree-size] [--breakdown] [--json]
    -b, --breakdown                  Analyze entire repository and display detailed usage statistics
    -j, --json                       Output results as JSON
    -r, --rev REV                    Analyze specific git revision
                                     defaults to HEAD, see gitrevisions(1) for alternatives
    -t, --tree-size=NUMBER           Maximum number of files scanned to detect languages (default: 100000)
    -h, --help                       Display a short usage summary, then exit

[acid-bong]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 431923

Logs: https://github.com/acid-bong/nixpkgs-review-gha/actions/runs/16823032455

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x86_64-linux

✅ 1 package built:

• github-linguist

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aarch64-linux

✅ 1 package built:

• github-linguist

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x86_64-darwin (sandbox = true)

✅ 1 package built:

• github-linguist

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aarch64-darwin (sandbox = true)

✅ 1 package built:

• github-linguist

[acid-bong]

Approved automatically following the successful run of nixpkgs-review.

[Cryolitia]

LGTM