minor #36976 [Contracts/Deprecation] fix composer.json for PHP 8 (xepozz)
minor #36976 [Contracts/Deprecation] fix composer.json for PHP 8 (xepozz)

This PR was merged into the 5.1 branch.

Discussion
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[Contracts/Deprecation] fix composer.json for PHP 8

| Q             | A
| ------------- | ---
| Branch?       | 5.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Spotted by @xepozz in https://github.com/symfony/deprecation-contracts/pull/2

Commits
-------

5db0a8bf4b [Contracts/Deprecation] fix composer.json for PHP 8

tgalopin/symfony,damienalexandre/symfony,Nyholm/symfony,nicolas-grekas/symfony,nicolas-grekas/symfony,Deamon/symfony,Tobion/symfony,paradajozsef/symfony,ro0NL/symfony,OskarStark/symfony,sgehrig/symfony,pierredup/symfony,pierredup/symfony,hhamon/symfony,xabbuh/symfony,mpdude/symfony,MatTheCat/symfony,fabpot/symfony,tucksaun/symfony,stof/symfony,nicolas-grekas/symfony,smatyas/symfony,fabpot/symfony,paradajozsef/symfony,jderusse/symfony,kbond/symfony,curry684/symfony,nicolas-grekas/symfony,phramz/symfony,curry684/symfony,chalasr/symfony,chalasr/symfony,sgehrig/symfony,damienalexandre/symfony,HeahDude/symfony,xabbuh/symfony,voronkovich/symfony,jderusse/symfony,symfony/symfony,stof/symfony,voronkovich/symfony,MatTheCat/symfony,sgehrig/symfony,smatyas/symfony,gonzalovilaseca/symfony,derrabus/symfony,smatyas/symfony,Deamon/symfony,xabbuh/symfony,phramz/symfony,paradajozsef/symfony,chalasr/symfony,smatyas/symfony,jvasseur/symfony,mpdude/symfony,Nyholm/symfony,mweimerskirch/symfony,OskarStark/symfony,smatyas/symfony,gonzalovilaseca/symfony,Deamon/symfony,voronkovich/symfony,mpdude/symfony,Slamdunk/symfony,lyrixx/symfony,tucksaun/symfony,lyrixx/symfony,fabpot/symfony,ro0NL/symfony,Slamdunk/symfony,ogizanagi/symfony,hhamon/symfony,OskarStark/symfony,symfony/symfony,MatTheCat/symfony,mweimerskirch/symfony,derrabus/symfony,kbond/symfony,Nyholm/symfony,symfony/symfony,jderusse/symfony,ro0NL/symfony,lyrixx/symfony,oleg-andreyev/symfony,tucksaun/symfony,lyrixx/symfony,ogizanagi/symfony,mpdude/symfony,Tobion/symfony,HeahDude/symfony,chalasr/symfony,phramz/symfony,jvasseur/symfony,paradajozsef/symfony,oleg-andreyev/symfony,mweimerskirch/symfony,HeahDude/symfony,Tobion/symfony,Deamon/symfony,d-ph/symfony,jderusse/symfony,tgalopin/symfony,tucksaun/symfony,Nyholm/symfony,Slamdunk/symfony,fabpot/symfony,pierredup/symfony,ro0NL/symfony,kbond/symfony,HeahDude/symfony,tgalopin/symfony,xabbuh/symfony,jvasseur/symfony,tgalopin/symfony,phramz/symfony,stof/symfony,ogizanagi/symfony,OskarStark/symfony,Deamon/symfony,stof/symfony,pierredup/symfony,damienalexandre/symfony,derrabus/symfony,d-ph/symfony,d-ph/symfony,gonzalovilaseca/symfony,symfony/symfony,voronkovich/symfony,gonzalovilaseca/symfony,damienalexandre/symfony,mweimerskirch/symfony,derrabus/symfony,ogizanagi/symfony,oleg-andreyev/symfony,MatTheCat/symfony,Slamdunk/symfony,sgehrig/symfony,Tobion/symfony,hhamon/symfony,d-ph/symfony,oleg-andreyev/symfony,hhamon/symfony,jvasseur/symfony,kbond/symfony,mweimerskirch/symfony,curry684/symfony,curry684/symfony