Update slevomat/coding-standard requirement from ^6.1.5 to ^6.2.0
Update slevomat/coding-standard requirement from ^6.1.5 to ^6.2.0

Updates the requirements on [slevomat/coding-standard](https://github.com/slevomat/coding-standard) to permit the latest version.
- [Release notes](https://github.com/slevomat/coding-standard/releases)
- [Commits](https://github.com/slevomat/coding-standard/compare/6.1.5...6.2.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
doctrine/coding-standard,doctrine/coding-standard