Update nepada/coding-standard requirement from 7.3 to 7.4.0

Updates the requirements on [nepada/coding-standard](https://github.com/nepada/coding-standard) to permit the latest version.
- [Release notes](https://github.com/nepada/coding-standard/releases)
- [Commits](nepada/coding-standard@v7.3.0...v7.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -30,7 +30,7 @@
         "spaze/phpstan-disallowed-calls": "1.4.0",
         "phpstan/phpstan-mockery": "0.12.13",
         "php-parallel-lint/php-parallel-lint": "1.3.0",
-        "nepada/coding-standard": "7.3"
+        "nepada/coding-standard": "7.4.0"
     },
     "autoload": {
         "psr-4": {