shell-gpt: Add missing dependencies for functions feature.

[SohamG]

Resolve #400438

Things done

• Add requests and jinja2 as propogatedBuildInputs to enable sgpt to work after running sgpt --install-functions
• Add myself as maintainer along with original maintainer.

CC: @MGlolenstine

• 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.

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[MGlolenstine]

@SohamG I haven't used this package in a really long while and other people seem to be more active updating it than I am. Seeing that you've added yourself to maintainers, I'm down with being removed from maintainers.

Thank you for improving the nix package ecosystem :)

[SohamG]

Testing strategy:

1. ./result/bin/sgpt --install-functions
2. ./result/bin/sgpt --functions "what are the contents of the folder .."
3. Expected output should have the contents of the parent folder in the LLM's reply.

[SohamG]

@MGlolenstine Oh, thanks for letting me know. I'll go ahead and remove you from the maintainers. Thanks for the contributions to the package so far!

[MGlolenstine]

LGTM!

[SohamG]

@NixOS/nixpkgs-merge-bot merge

[nixpkgs-merge-bot]

@SohamG merge not permitted (#305350):
CommitterPR: pr author is not committer
R-Ryantm Maintainer merge: pr author is not r-ryantm