fix(release): Manage git state after post-release

[iker-barriocanal]

From Craft docs:

The script is responsible for any and all git state management as craft will simply exit after running this script as the final step. This means the script is responsible for committing and pushing any changes that it may have made.

Git state isn't managed in the post-release script, meaning changes won't be pushed; this PR manages it.

#skip-changelog

[marandaneto]

@iker-barriocanal there's a conflict, besides that, LGTM