Update protocol from `git://` to `https://` in the docs

[antonbabenko]

https protocol is recommended (more secure, no MITM attacks).

Example:

https://github.com/ansible/ansible-language-server/blob/9aa72897b1290b878e257b715a3a149f81890124/.pre-commit-config.yaml#L41-L43