Describe the bug
Recently we have bumped requirements for a project and it has started to use Symfony 7.x, more exactly the Cache component. And, while phplint is passing perfectly with PHP 7.x, for any run with PHP >= 8.0, we get the following error:

PHP Fatal error:  Declaration of Symfony\Component\Cache\CacheItem::expiresAt(?DateTimeInterface $expiration): static must be compatible with PsrExt\Cache\CacheItemInterface::expiresAt($expiration) in /home/runner/work/moodle-cs/moodle-cs/vendor/symfony/cache/CacheItem.php on line 77

Example run: https://github.com/stronk7/moodle-cs/actions/runs/7118709260

Then, looking to the list of installed extensions (wiki), I cannot see the php-psr extension there.

But, if I disable it in the workflow (workaround) using extensions: :php-psr, then the tests pass ok.

Example run: https://github.com/stronk7/moodle-cs/actions/runs/7118979626

So, apart from the apparent incompatibility between Symfony Cache 7.x and the PSR extension... and why we are (or not) linting the vendor directory... this issue is more about to clarify if the extension is correctly installed (and should be listed in the docs). Or if it's installed "by mistake", and it shouldn't.

Version

• I have checked releases, and the bug exists in the latest patch version of v1 or v2.
• v2
• v1

Runners

• GitHub Hosted
• Self Hosted

Operating systems
ubuntu-latest (22.04)

PHP versions
8.0 to 8.2 (probably also 8.3)

To Reproduce
Install Symfony Cache 7.x and try PHP-linting.
Get the linting problem detailed in the description.

Expected behavior
Linting should end ok

Screenshots/Logs

• failing run (because php-psr is installed by default): https://github.com/stronk7/moodle-cs/actions/runs/7118709260

Additional context

Are you willing to submit a PR?
I'm afraid, I don't know enough :-)