bug: Fail to download dependency when use protocol 'git://'

[zong-zhe]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Use the following command to add dependency

kcl mod add --git git://github.com/kcl-lang/flask-demo-kcl-manifests.git --tag v0.1.0 

2. What did you expect to see? (Required)

Adding the dependency successfully.

3. What did you see instead (Required)

An error raised:

cloning 'git://github.com/kcl-lang/flask-demo-kcl-manifests.git' with tag 'v0.1.0'
error downloading 'git://github.com/kcl-lang/flask-demo-kcl-manifests.git?ref=v0.1.0': /usr/bin/git exited with 128: Cloning into '/var/folders/yt/9fs5v0ls7_q4kn7dq3k6nz3h0000gp/T/2114308516/git'...
fatal: unable to connect to github.com:
github.com[0: 20.205.243.166]: errno=Operation timed out

4. What is your KCL components version? (Required)

The main branch