lock php-cs-fixer version to 3.77.0

[vaivasav]

Description

From 3.78.0 to latest version there problem that fixed does not recognize readonly and creates error that visibility required

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• Tech. debt (non-breaking code improvement or technical functionality)

Code testing

• Manual testing done

Code quality

• My changes generate no new warnings or errors in IDE
• I have performed a self-review of my own code before selecting reviewers
• My code does not smell (I am sure about my code quality, I did the best I could)