Remove Reflection*::setAccessible() calls + drop PHP < 8.1

[W0rma]

As of PHP 8.1.0, calling this method has no effect; all methods are invokable by default.

(https://www.php.net/manual/en/reflectionmethod.setaccessible.php and https://www.php.net/manual/en/reflectionproperty.setaccessible.php).

There're even plans to deprecate the method in PHP 8.5: https://wiki.php.net/rfc/deprecations_php_8_5#extreflection_deprecations

This PR drops support for PHP < 8.1.
Thus, the calls can be safely removed.

[W0rma]

CI failure will be fixed in #52

[SamMousa]

@W0rma you should have an update button here (because I merged #52), alternatively please merge in master so the CI stops failing please!

[W0rma]

@SamMousa Rebase done - thank you!

[SamMousa]

I cannot casually merge a PHP version bump though... So this will require a major release.
And personally I'd argue that if we do one, we should be dropping all old versions of PHP, so everything < 8.4.

[W0rma]

So this will require a major release.

I noticed that for Codeception itself a PHP version bump was done in a minor release ( https://github.com/Codeception/Codeception/releases/tag/5.3.0 ).
I'm okay with this approach because IMO bumping a PHP version does not break existing code - apps using a lower PHP version will just not be able to install the latest package version.

But I'm okay if you prefer to not bump the PHP version in a minor/patch release.

I could rework this PR to only call setAccessable() if PHP < 8.1 is used. WDYT?

[SamMousa]

I noticed that for Codeception itself a PHP version bump was done in a minor release

Fair enough, a minor release it is then! We don't have a very big group (or well organised group) of maintainers.

I'll merge this, then I'll try and figure out how we do releases for this repo.

[github-actions]

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