[Scoper] Remove PHP_VERSION_ID < 70400 check on scoper.php

[samsonasik]

This was hack to handle issue:

• Error on php 7.2 and php 7.3 with nette/utils 4.0 rector#8564

since rector scoped now require php 7.4, this hack is not needed.

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it ;)

[samsonasik]

For note: we may need to have special downgrade rule for this for to downgrade to < 7.4 compatible code, for example, on easy-coding-standard, which uses 7.2 have the same code, which if on specific circumstance executed, it will error:

https://github.com/easy-coding-standard/easy-coding-standard/blob/4b90f2b6efed9508000968eac2397ac7aff34354/vendor/nette/utils/src/Utils/Strings.php#L566

[github-actions]

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