Drop PHP <7.1 and Symfony <5.3 support

[wouter-toppy]

Fix for #996

For tag 3.x

[chalasr]

Awesome! Thanks for working on this @wouter-toppy.

[wouter-toppy]

@chalasr still trying to test and fix the ci

[chalasr]

Looks good to me. I'll merge this very soon and send a follow-up PR to remove the whole security-guard integration.

[wouter-toppy]

@chalasr tests completed. and on my part the issue is resolved

[wouter-toppy]

@chalasr any idea when i can expect this to be merged (and tagged in 3.x)
Dont know if you still have other pulls/issues you want to merge into the 3.x branch

the JWTRefreshTokenBundle Pull is merged already, and hopefully gets a tag soon.

after that this is the only thing that blocks our WMS upgrade to Symfony 6.1 and PHP 8.1. because we can't enable preloading because of the original issue of this pull

[chalasr]

Thank you @wouter-toppy.

[chalasr]

Note that I'm not going to tag 3.0 now, there is quite a lot of cleanup and work ongoing on 2.x before I can (should happen at some point by the end of the year). Of course meanwhile you can require the 3.x-dev version or some commit hash.