Remove "symfony/polyfill-php72" from the dependencies

[rosier]

PHP version 7.2+ is already required by Symfony 5

[voronkovich]

@rosier, You should commit the composer.lock too. If you changed the composer.json manually, use composer update --lock command to update lock-file (See https://getcomposer.org/doc/03-cli.md#update-u).

BTW, it's better to remove packages using composer remove command:

$ composer remove symfony/polyfill-php72

[stof]

if you really want to ensure it is not there, you might need to add it in the replace section as well, as some other packages might depend on it.

[rosier]

@voronkovich I used the web interface of GitHub and forgot the composer.lock. I have amended the commit.

@stof I will make a new PR for the replace section later to include the other unneeded polyfills too

[rosier]

Tests fail on php-cs-fixer, but I think that is already addressed in #1063

[javiereguiluz]

@rosier thanks for this contribution! However, I'm afraid that after merging other PRs, this PR now has some conflicts. Could you please fix it again so we can merge it? Thanks.

[rosier]

I resolved the conflicts. The tests fail on a segmentation fault of ./bin/phpunit

[rosier]

@stof I have now add a replace section as well

[javiereguiluz]

Thanks for the rebasing and thanks a lot for your contribution!