[TASK] change sg_mail dependency from >= 8 to >= 7

composer.json

@@ -12,7 +12,7 @@
 	},
 	"require": {
 		"typo3/cms-core": "^10.4.0 || ^11.5.0",
-		"sgalinski/sg-mail": ">=8.0.0",
+		"sgalinski/sg-mail": ">=7.0.0",
 		"sgalinski/sg-ajax": ">=4.0.0",
 		"sgalinski/sg-seo": ">=6.0.0"
 	},