Fix CI (#12)

Author: fre5h

composer.json

@@ -21,12 +21,12 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.3",
-        "phpstan/phpstan": "^1.2.0",
-        "phpstan/phpstan-phpunit": "^1.0.0",
+        "phpstan/phpstan": "^1.3",
+        "phpstan/phpstan-phpunit": "^1.0",
         "phpunit/phpunit": "^9.5",
         "slam/phpstan-extensions": "^6.0",
         "squizlabs/php_codesniffer": "^3.6",
-        "thecodingmachine/phpstan-strict-rules": "^1.0.0"
+        "thecodingmachine/phpstan-strict-rules": "^1.0"
     },
     "autoload": {
         "psr-4": {

src/DateTimeCloner.php

@@ -32,6 +32,7 @@ class DateTimeCloner
      */
     public static function cloneIntoDateTime(\DateTimeInterface $originalDate): \DateTime
     {
+        /** @var \DateTimeZone|false $timezone */
         $timezone = $originalDate->getTimezone();
         $date = \DateTime::createFromFormat(
             self::DATE_FORMAT_FOR_CLONE,
@@ -55,6 +56,7 @@ public static function cloneIntoDateTime(\DateTimeInterface $originalDate): \Dat
      */
     public static function cloneIntoDateTimeImmutable(\DateTimeInterface $originalDate): \DateTimeImmutable
     {
+        /** @var \DateTimeZone|false $timezone */
         $timezone = $originalDate->getTimezone();
         $date = \DateTimeImmutable::createFromFormat(
             self::DATE_FORMAT_FOR_CLONE,