minor #44488 Remove duplicated entry in UPGRADE-6.0.md (fancyweb)
minor #44488 Remove duplicated entry in UPGRADE-6.0.md (fancyweb)

This PR was merged into the 5.4 branch.

Discussion
----------

Remove duplicated entry in UPGRADE-6.0.md

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | https://github.com/symfony/symfony/issues/44486
| License       | MIT
| Doc PR        | -

Commits
-------

6353479951 Remove duplicated entry in UPGRADE-6.0.md

damienalexandre/symfony,nicolas-grekas/symfony,HeahDude/symfony,stof/symfony,mpdude/symfony,symfony/symfony,symfony/symfony,curry684/symfony,ogizanagi/symfony,paradajozsef/symfony,symfony/symfony,HeahDude/symfony,mpdude/symfony,tucksaun/symfony,ro0NL/symfony,xabbuh/symfony,sgehrig/symfony,damienalexandre/symfony,nicolas-grekas/symfony,paradajozsef/symfony,derrabus/symfony,phramz/symfony,xabbuh/symfony,d-ph/symfony,hhamon/symfony,nicolas-grekas/symfony,ogizanagi/symfony,curry684/symfony,symfony/symfony,hhamon/symfony,Tobion/symfony,xabbuh/symfony,hhamon/symfony,ro0NL/symfony,HeahDude/symfony,d-ph/symfony,paradajozsef/symfony,derrabus/symfony,mpdude/symfony,tucksaun/symfony,damienalexandre/symfony,curry684/symfony,ogizanagi/symfony,ro0NL/symfony,xabbuh/symfony,Tobion/symfony,tucksaun/symfony,HeahDude/symfony,Tobion/symfony,sgehrig/symfony,phramz/symfony,nicolas-grekas/symfony,d-ph/symfony,phramz/symfony,sgehrig/symfony,stof/symfony,Tobion/symfony,stof/symfony,curry684/symfony,ro0NL/symfony,sgehrig/symfony,phramz/symfony,mpdude/symfony,ogizanagi/symfony,d-ph/symfony,stof/symfony,derrabus/symfony,paradajozsef/symfony,damienalexandre/symfony,tucksaun/symfony,hhamon/symfony,derrabus/symfony