Prepare v2.7.0 release

[PaulRotmann]

Preparation for release v2.7.0 on 2025-01-24.

[KentarouTakeda]

@clue
Are you planning to publish the recent changes, including this pull request, as a new version?

I think #107 in particular is an important change for users. Currently, we are concerned that the following warning message is always displayed when we run tools that use our library on php-8.4 or higher:

Clue\React\Stdio\Stdio::__construct(): Implicitly marking parameter $loop as nullable is deprecated, the explicit nullable type must be used instead

Clue\React\Stdio\Stdio::__construct(): Implicitly marking parameter $input as nullable is deprecated, the explicit nullable type must be used instead

Clue\React\Stdio\Stdio::__construct(): Implicitly marking parameter $output as nullable is deprecated, the explicit nullable type must be used instead

Clue\React\Stdio\Stdio::__construct(): Implicitly marking parameter $readline as nullable is deprecated, the explicit nullable type must be used instead

Clue\React\Stdio\Stdio::createStdin(): Implicitly marking parameter $loop as nullable is deprecated, the explicit nullable type must be used instead

Clue\React\Stdio\Stdio::createStdout(): Implicitly marking parameter $loop as nullable is deprecated, the explicit nullable type must be used instead

[clue]

v2.7.0 is now released 🎉 https://github.com/clue/reactphp-stdio/releases/tag/v2.7.0

Thanks @PaulRotmann for preparing this! I finalized the release directly on 2.x, as this PR had drifted behind the newer changes that also went into v2.7.0 (PHP 8.5 support and more), so closing this one (refs also clue/reactphp-mq#52 and others).

@KentarouTakeda this release includes #107, so the implicitly nullable deprecation warnings on PHP 8.4+ are resolved. Thanks for the nudge!

I hope you enjoy this! 👍 If so, consider supporting this project, for example by becoming a sponsor ❤️