Fixed @phpstan-assert for methods in() and inArray()

GA: build.yml - PHPStan - updated PHP versions

Uses @phpstan-assert tag, depracated PHPStan extension

Bridges: PhpStan - fixed extension

Bridges: added PhpStan extension

Composer: allows nette/tester ^2.3

Readme: updated

Added Assert::true() & Assert::false()

Assert: added bool()