Update nepada/coding-standard requirement from 7.7.0 to 7.9.0

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@v7.7.0...v7.9.0)

---
updated-dependencies:
- dependency-name: nepada/coding-standard
  dependency-type: direct:development
...

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

composer.json

@@ -29,7 +29,7 @@
         "spaze/phpstan-disallowed-calls": "2.12.1",
         "shipmonk/phpstan-rules": "2.3.1",
         "php-parallel-lint/php-parallel-lint": "1.3.2",
-        "nepada/coding-standard": "7.7.0"
+        "nepada/coding-standard": "7.9.0"
     },
     "autoload": {
         "psr-4": {