Update syntatis/coding-standard requirement from ^1.4 to ^1.5

Updates the requirements on [syntatis/coding-standard](https://github.com/syntatis/phpcs-ruleset) to permit the latest version.
- [Release notes](https://github.com/syntatis/phpcs-ruleset/releases)
- [Commits](syntatis/phpcs-ruleset@v1.4.0...v1.5.0)

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

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

composer.json

@@ -48,7 +48,7 @@
 		"phpunit/phpunit": "^9.6",
 		"roots/wordpress": "^6.6",
 		"symfony/var-dumper": "^5.4",
-		"syntatis/coding-standard": "^1.4",
+		"syntatis/coding-standard": "^1.5",
 		"szepeviktor/phpstan-wordpress": "^1.3",
 		"wp-phpunit/wp-phpunit": "^6.6",
 		"yoast/phpunit-polyfills": "^3.0"