AC-13253::Add Strict Type Check for Parameter

Author: cod43156

app/code/Magento/Email/Model/Transport.php

@@ -123,7 +123,7 @@ class Transport implements TransportInterface
     public function __construct(
         EmailMessageInterface $message,
         ScopeConfigInterface $scopeConfig,
-        LoggerInterface $logger = null
+        ?LoggerInterface $logger = null
     ) {
         $this->isSetReturnPath = (int) $scopeConfig->getValue(
             self::XML_PATH_SENDING_SET_RETURN_PATH,

lib/internal/Magento/Framework/Mail/EmailMessage.php

@@ -309,7 +309,7 @@ public function toString(): string
      * @param array $addressList
      * @return array
      */
-    private function convertAddressListToAddressArray($addressList): array
+    private function convertAddressListToAddressArray(array $addressList): array
     {
         return array_map(function ($address) {
             return $this->addressFactory->create([