Unable to install log4php using composer

I'm trying to deploy my PHP webapp on my ubuntu server. running composer install ends with the following exception:

  [RuntimeException]                                                                                                                                                                                                    
  Failed to execute git clone --no-checkout 'https://git-wip- 
  us.apache.org/repos/asf/logging-log4php.git' 
  '/var/www/webapp/public_html/vendor/apache/log4php' && cd 
  '/var/www/webapp/public_html/vendor/apache/log4php' && git remote 
  add composer 'https://git-wip-us.apache.org/repos/asf/logging-log4php.git' && git fetch composer                                                                            

  Cloning into '/var/www/webapp/public_html/vendor/apache/log4php'...                                                                                                                                      
  fatal: repository 'https://git-wip-us.apache.org/repos/asf/logging-log4php.git/' not found  

I've tried to add explicit repositories to the composer.json as below still with out any progress

"repositories": [
  {
    "type": "vcs",
    "url": "https://github.com/apache/logging-log4php"
  }
],
"require": {
  "apache/log4php": "2.3.0",
  "phpmailer/phpmailer": "~6.0"
}

What am I missing?

They've just migrated.

After you correct link to repository, do not forget to recreate your composer.lock file. Probably the simplest way is to delete it and run composer install