Update slevomat/coding-standard requirement from ^6.4 to ^7.0 in /build-cs#3

dependabot[bot] wants to merge 2 commits intomasterarnaud-lb/phpstan-doctrine:masterfrom

dependabot/composer/build-cs/slevomat/coding-standard-tw-7.0arnaud-lb/phpstan-doctrine:dependabot/composer/build-cs/slevomat/coding-standard-tw-7.0Copy head branch name to clipboard