git: 2.30.1 -> 2.30.2

[rb2k]

Motivation for this change

This should fix the vulnerability described in https://github.blog/2021-03-09-git-clone-vulnerability-announced/

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[rb2k]

Waiting for my nixpkgs-review processes to finish...

(also: switching to stanging-next given the amount of packages)

[primeos]

Thanks but this update is already in staging: #115597
(If deemed necessary we could consider pushing it to staging-next as well.)

[rb2k]

Ahhh, I looked in the wrong place then. Great :)