fix(git): use branch --show-current to get current branch

[EstebanBorai]

Description

Updates the git command used to get the current branch from:

git rev-parse --abbrev-ref HEAD

To be:

git branch --show-current

git branch --show-current is available since Git 2.22 which was released Mid 2019
(official release notes https://public-inbox.org/git/xmqq36klozfu.fsf@gitster-ct.c.googlers.com/).

macOS Ventura uses git version 2.39.3 so this should be safe for users from Ventura and up.

Related Issues

• 🐞 Git: "ambiguous argument HEAD" #1594

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

[activcoding]

LGTM
Just a quick heads-up, we should prioritise adding tests for Git to catch bugs earlier. But for now, let's stay focused on the editor

[thecoolwinter]

LGTM