Bump minimum requirements for a 2.8 release

[mpdude]

This raises minimum requirements to PHP 8.1, Symfony components with any kind of maintenance (if security only).

Test matrix covers:

• PHP 8.1 with Symfony 5.4 components
• PHP 8.1 with Symfony 6.4 components
• PHP 8.2 – 8.4 with Symfony ^7.3 components

[mpdude]

@stof WDYT?

[mpdude]

I could also use Flex to make sure also transitive Symfony dependencies match the given version.

[stof]

using Flex would be better for 2 reasons:

• it also locks transitive dependencies, matching the way this is used for projects locking a LTS version
• Flex will combine its restriction with the actual package requirement instead of replacing the requirement entirely

[stof]

I would also add an explicit job for Symfony 7.4, as it is also a LTS version.

[stof]

I would also keep a job on PHP 8.1 with unmodified dependencies.

[stof]

as you are adding new PHP versions, you can add 8.5 as well.

[acoulton]

Looks like this was partially addressed by #50 - although I agree it would be better to manage the symfony requirements with flex instead of the custom script.

It also looks like the project no longer declares its supported symfony/dependency-injection versions: Behat now recommends that extensions explicitly require symfony packages rather than depending on them as transitive Behat dependencies.

[mpdude]

@pamil and/or @stof please advise how to proceed here after #50 and #51 were merged into master.

• Shall we still try to put this on a 2.x branch?
• Do we want to support Symfony 6.4 (LTS) on the 3.x/master version as well?