Allow PHPUnit 11

[Jean85]

This PR is the only code change needed to run with PHPUnit 11, but it also requires phpspec/prophecy#616, as proved by #58.

[Jean85]

Tests seem to fail only due to #60

[EDIT] It does not seem to be using PHPUnit 11 in CI, except for the "dev deps" job... What could be the blocker? Oh right, Prophecy didn't get a tag yet.

[stof]

@Jean85 that's expected: the PR in prophecy has been merged, but there has not been a new release yet. So jobs running with stable dependencies cannot install a version of Prophecy supporting PHPUnit 11 yet (that's the whole point of having a job running with dev deps btw: testing those things before the release instead of only after it).

[Jean85]

Right right, I figured out the same while you were replying.

So, it's seems to work, apart from the deprecation that I already reported in #60.

[stof]

For the deprecation, let's wait for the answer of Sebastian about the proper way to solve our case (see my comment in the issue and the corresponding issue opened in the phpunit issue tracker)

[Jean85]

@stof I've introduced the attributes, and fixed the build with a dedicated, migrated configuration.

[jorgsowa]

Thank you for this PR. Do you have a plan to release a new version of the package with the support for PHPUnit 11?