fix cloning submodules

[kroggen]

This fixes the problem of cloning submodules:

~/HRM$ git submodule update --init --recursive
Cloning into '/root/HRM/dataset/raw-data/ARC-AGI'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:fchollet/ARC-AGI.git' into submodule path '/root/HRM/dataset/raw-data/ARC-AGI' failed
Failed to clone 'dataset/raw-data/ARC-AGI'. Retry scheduled

Cloning into '/root/HRM/dataset/raw-data/ARC-AGI-2'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:arcprize/ARC-AGI-2.git' into submodule path '/root/HRM/dataset/raw-data/ARC-AGI-2' failed
Failed to clone 'dataset/raw-data/ARC-AGI-2'. Retry scheduled

Cloning into '/root/HRM/dataset/raw-data/ConceptARC'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:victorvikram/ConceptARC.git' into submodule path '/root/HRM/dataset/raw-data/ConceptARC' failed
Failed to clone 'dataset/raw-data/ConceptARC'. Retry scheduled

The use of https:// fixes that as no login is necessary