Drop `git` in gemspec

[utkarsh2102]

Hi @carlosantoniodasilva 👋🏻

As discussed in #278, here's the PR, fixing that! It also adds the Packaging extension so that it helps the downstream maintainers 💫

Hope this is good to go! Please let me know if you want me to expand on anything! 😄

Closes: #278

Signed-off-by: Utkarsh Gupta <[email protected]>

[utkarsh2102]

Hello @carlosantoniodasilva,

Just a slight ping on this^ 😄

[carlosantoniodasilva]

@utkarsh2102 thanks! It's on my radar and I'll try to get back to it later this week, just have some other things to wrap up here first. 👍