feat: drop support for symfony 4

[Chris53897]

Symfony 4.4 is EOL in the end of november. https://symfony.com/releases/4.4

[alexislefebvre]

Thanks for the PR, please note that the testLoadFixturesCheckReferences test is broken right now, see:

• fix: testLoadFixturesCheckReferences #244

The “Symfony ^5.4 on PHP 7.4 flags” job should be green here though.

[alexislefebvre]

The broken test testLoadFixturesCheckReferences has been skipped on the main branch

• chore: skip testLoadFixturesCheckReferences #247

Please rebase this PR and remove the changes in ConfigMysqlCacheDbTest.

[alexislefebvre]

What is the intent of this change?

[Chris53897]

Otherwise i get the following error. Maybe this is only for runs on pull requests?
https://github.com/liip/LiipTestFixturesBundle/actions/runs/6841422883/job/18601768024

Symfony on PHP 7.4 flags update --prefer-lowest
ocramius/package-versions contains a Composer plugin which is blocked by your allow-plugins config. You may add it to the list if you consider it safe.
You can run "composer config --no-plugins allow-plugins.ocramius/package-versions [true|false]" to enable it (true) or disable it explicitly and suppress this exception (false)
See https://getcomposer.org/allow-plugins

[Chris53897]

I have readded this paragraph to make CI green.

[Chris53897]

I need to bump more dev dependencies to make ci green for --prefer-lowest

[alexislefebvre]

You can run composer config --no-plugins allow-plugins.ocramius/package-versions true on your branch then commit the composer.json file. So that contributors of this bundle won't have the same error message. Then remove the change in .github/workflows/tests.yml.

[Chris53897]

Yes i can do this.
Some maintainers, want to have this in composer.json, and others only in the ci.
ohdearapp/health-check-results#5

[Chris53897]

Done

[alexislefebvre]

Thanks!