Fix PHPStan issues

This commit will fix an issue but ignore two of them because it will
require some refactoring that won't be possible in a PATCH version.

Signed-off-by: Henrique Moody <henriquemoody@gmail.com>

library/Rules/Ip.php

@@ -181,7 +181,7 @@ final class Ip extends AbstractRule
             throw new ComponentException('Invalid network mask');
         }
 
-        $this->mask = sprintf('%032b', ip2long(long2ip(~(2 ** (32 - (int) $parts[1]) - 1))));
+        $this->mask = sprintf('%032b', ip2long((string) long2ip(~(2 ** (32 - (int) $parts[1]) - 1))));
     }
 
     private function verifyAddress(string $address): bool

phpstan.neon.dist

@@ -10,14 +10,18 @@ parameters:
   checkGenericClassInNonGenericObjectType: false
   checkMissingIterableValueType: false
   ignoreErrors:
+    -
+      message: '/Ternary operator condition is always false\./'
+      path: library/Helpers/CanValidateDateTime.php
+
     -
       message: '/Instanceof between mixed and SimpleXMLElement will always evaluate to false\./'
       path: library/Rules/ArrayVal.php
+
     -
-      message: '/Parameter #1 \$error_handler of function set_error_handler expects \(callable\(int, string, string, int, array\): bool\)\|null, Closure\(\): void given\./'
-      paths:
-        - library/Rules/Call.php
-        - tests/unit/Rules/CallTest.php
+      message: '/Return type \(SplObjectStorage\) of method Respect\\Validation\\Exceptions\\NestedValidationException::getIterator\(\)/'
+      path: library/Exceptions/NestedValidationException.php
+
     -
       message: '/Call to an undefined static method Respect\\Validation\\Validator::iDoNotExistSoIShouldThrowException/'
       path: tests/unit/ValidatorTest.php