Update to dealerdirect/phpcodesniffer-composer-installer to dev-master

This is a temporary bump until 0.7.1 is realeased, which is slated to
include the fixes from Kevin's PR here:
PHPCSStandards/composer-installer#126

composer.json

@@ -3,15 +3,9 @@
 	"description": "PHPCS sniffs for Alley Interactive",
 	"type": "phpcodesniffer-standard",
 	"license": "GPL-2.0-or-later",
-	"repositories": [
-		{
-			"type": "vcs",
-			"url": "https://github.com/kevinfodness/phpcodesniffer-composer-installer"
-		}
-	],
 	"require": {
 		"squizlabs/php_codesniffer": "^3.5.0",
-		"dealerdirect/phpcodesniffer-composer-installer": "dev-hotfix/alphabetize-installed-paths",
+		"dealerdirect/phpcodesniffer-composer-installer": "dev-master",
 		"wp-coding-standards/wpcs": "^2.3.0",
 		"automattic/vipwpcs": "^2.1.0",
 		"phpcompatibility/phpcompatibility-wp": "*"