minor #41281 Add 5.3 in github PR template (jderusse)
minor #41281 Add 5.3 in github PR template (jderusse)

This PR was merged into the 4.4 branch.

Discussion
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Add 5.3 in github PR template

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

Right time now :)

Commits
-------

327014b104 Add 5.3 in github PR template

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