Log Message:
php-composer: Update to 2.2.6

Upstream release notes:
  2.2.6: https://github.com/composer/composer/releases/tag/2.2.6
  2.2.5: https://github.com/composer/composer/releases/tag/2.2.5
  2.2.4: https://github.com/composer/composer/releases/tag/2.2.4
  2.2.3: https://github.com/composer/composer/releases/tag/2.2.3
  2.2.2: https://github.com/composer/composer/releases/tag/2.2.2
  2.2.1: https://github.com/composer/composer/releases/tag/2.2.1
  2.2.0: https://github.com/composer/composer/releases/tag/2.2.0