Merge branch 'cs/#6939-trailing-spaces-in-zend-validator-hostname'

Close #6939
Use self.version at Zend\Debug composer.json for require zend/escaper
use 2.* instead of self.version in require-dev zendframework/zend-escaper in Debug\composer.json
Merge branch 'deps/#6630-use-zend-escaper-2.x-for-zend-debug' into develop

Close #6630
Forward port #6630