Fix repository base url of Ubuntu.

[ohsawa0515]

Environment:

• Ubuntu 20.04 LTS
• Ansible 2.11.4
• ansible-role-nvidia-driver: v2.0.1

When nvidia_driver_ubuntu_install_from_cuda_repo is yes, I got the following error:

Playbook

- name: Install NVIDIA Driver
  hosts: hogehoge

  roles:
    - role: nvidia.nvidia_driver
      tags: "nvidia"
      vars:
        - nvidia_driver_ubuntu_install_from_cuda_repo: yes
        - nvidia_driver_package_version: "465.19.01-1"
        - nvidia_driver_skip_reboot: yes

Error

TASK [nvidia.nvidia_driver : add repo] ****************************************************************************************************
fatal: [hogehoge]: FAILED! => changed=false 
  msg: 'Failed to update apt cache: E:Failed to fetch https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/by-hash/SHA256/751939d95516afc289908a19e447f0acc1506367f72ed356431a2b1a469cc8ca  404  Not Found [IP: 152.199.39.144 443], E:Some index files failed to download. They have been ignored, or old ones used instead.'

On the NVIDIA official page, the URL is HTTPS, but before modification it is HTTP.

https://developer.nvidia.com/cuda-downloads?target_os=Linux&target_arch=x86_64&Distribution=Ubuntu&target_version=20.04&target_type=deb_network

[ajdecon]

@ohsawa0515 : Thanks for this PR, this looks good to me!

Before I merge, can you please add a Signed-off-by line to your commit? See https://github.com/NVIDIA/deepops/blob/master/CONTRIBUTING.md for our contributing guide.