minor #38838 [ProxyManager] use "composer/package-versions-deprecated" instead of "ocramius/package-versions" (nicolas-grekas)
minor #38838 [ProxyManager] use "composer/package-versions-deprecated" instead of "ocramius/package-versions" (nicolas-grekas)

This PR was merged into the 4.4 branch.

Discussion
----------

[ProxyManager] use "composer/package-versions-deprecated" instead of "ocramius/package-versions"

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

As highlighted by our CI, `ocramius/proxy-manager` cannot be installed on PHP 7.3 using composer 2 because of broken versioning policies:
![image](https://user-images.githubusercontent.com/243674/97278564-37e73080-183a-11eb-885c-7b3cc07c26af.png)

Fortunately, the package that causes all this mess (`ocramius/package-versions`) has been forked precisely to work around these broken policies.

Requiring this fork allows resolving the dependencies properly.

Commits
-------

8cf60c4ab7 [ProxyManager] use "composer/package-versions-deprecated" instead of "ocramius/package-versions"

hhamon/symfony,Slamdunk/symfony,zerkms/symfony,hhamon/symfony,OskarStark/symfony,d-ph/symfony,MatTheCat/symfony,ogizanagi/symfony,sgehrig/symfony,ogizanagi/symfony,Taluu/symfony,stof/symfony,damienalexandre/symfony,d-ph/symfony,HeahDude/symfony,sgehrig/symfony,OskarStark/symfony,Nyholm/symfony,Tobion/symfony,Nyholm/symfony,symfony/symfony,ro0NL/symfony,d-ph/symfony,xabbuh/symfony,zerkms/symfony,damienalexandre/symfony,MatTheCat/symfony,nicolas-grekas/symfony,Slamdunk/symfony,symfony/symfony,ogizanagi/symfony,tucksaun/symfony,xabbuh/symfony,symfony/symfony,curry684/symfony,HeahDude/symfony,derrabus/symfony,hhamon/symfony,sgehrig/symfony,d-ph/symfony,Slamdunk/symfony,Taluu/symfony,paradajozsef/symfony,HeahDude/symfony,nicolas-grekas/symfony,Nyholm/symfony,ro0NL/symfony,symfony/symfony,ro0NL/symfony,ogizanagi/symfony,MatTheCat/symfony,xabbuh/symfony,oleg-andreyev/symfony,mpdude/symfony,derrabus/symfony,damienalexandre/symfony,tucksaun/symfony,nicolas-grekas/symfony,damienalexandre/symfony,Tobion/symfony,xabbuh/symfony,phramz/symfony,jderusse/symfony,Taluu/symfony,Taluu/symfony,nicolas-grekas/symfony,derrabus/symfony,MatTheCat/symfony,stof/symfony,Nyholm/symfony,HeahDude/symfony,jderusse/symfony,paradajozsef/symfony,Tobion/symfony,paradajozsef/symfony,curry684/symfony,zerkms/symfony,OskarStark/symfony,mpdude/symfony,curry684/symfony,jderusse/symfony,hhamon/symfony,ro0NL/symfony,mpdude/symfony,phramz/symfony,Slamdunk/symfony,sgehrig/symfony,jderusse/symfony,zerkms/symfony,oleg-andreyev/symfony,tucksaun/symfony,stof/symfony,oleg-andreyev/symfony,phramz/symfony,mpdude/symfony,curry684/symfony,oleg-andreyev/symfony,paradajozsef/symfony,phramz/symfony,OskarStark/symfony,stof/symfony,derrabus/symfony,tucksaun/symfony,Tobion/symfony