Update squizlabs/php_codesniffer requirement from ^3.5 to ^3.7

Updates the requirements on [squizlabs/php_codesniffer](https://github.com/squizlabs/PHP_CodeSniffer) to permit the latest version.
- [Release notes](https://github.com/squizlabs/PHP_CodeSniffer/releases)
- [Commits](squizlabs/PHP_CodeSniffer@3.5.0...3.7.1)

---
updated-dependencies:
- dependency-name: squizlabs/php_codesniffer
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -13,7 +13,7 @@
 	},
 	"require-dev": {
 		"phpunit/phpunit": "~7.5 | ~9.5",
-		"squizlabs/php_codesniffer": "^3.5",
+		"squizlabs/php_codesniffer": "^3.7",
 		"corpus/coding-standard": "^0.6.0",
 		"friendsofphp/php-cs-fixer": "^2.17"
 	},