php-composer: Update to 2.1.14

Upstream release notes:

2.1.14
- Fixed invalid release build (2.1.13 was deleted as invalid)
- Removed symfony/console ^6 support as we cannot be compatible until Composer
  2.3.0 is released. If you have issues with Composer required as a dependency
  + Symfony make sure you stay on Symfony 5.4 for now. (#10321)

2.1.12
- Fixed issues in proxied binary files relying on __FILE__ / __DIR__ on
  php <8 (#10261)
- Fixed 9999999-dev being shown in some cases by the show command (#10260)
- Fixed GitHub Actions output escaping regression on PHP 8.1 (#10250)

(tpaul)