php-composer: Update to 2.0.5

Upstream release notes:

* Disabled platform-check verification of extensions by default
  (now defaulting php-only), set platform-check to true if you want a complete
  check
* Improved platform-check handling of issue reporting
* Fixed platform-check to only check non-dev requires even if require-dev
  dependencies are installed
* Fixed issues dealing with custom installers which return trailing slashes in
  getInstallPath (ideally avoid doing this as there might be other issues left)
* Fixed issues when curl functions are disabled
* Fixed gitlab-domains/github-domains to make sure if they are overridden the
  default value remains present
* Fixed issues removing/upgrading packages from path repositories on Windows
* Fixed regression in 2.0.4 when handling of git@bitbucket.org URLs in vcs
  repositories
* Fixed issue running create-project in current directory on Windows

(tpaul)