[TASK] Update php dependencies

composer.json

@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.0",
         "typo3/cms-core": "^8.7.0 || ^9.5.1"
     },
     "require-dev": {

ext_emconf.php

@@ -19,7 +19,7 @@ $EM_CONF['sg_mail'] = [
 	'constraints' => [
 		'depends' => [
 			'typo3' => '8.7.0-9.5.99',
-			'php' => '7.1.0-',
+			'php' => '7.0.0-',
 		],
 		'conflicts' => [
 		],