fix phpstan/phpcs issues

Author: schlndh

src/Reflection/SignatureMap/Php8SignatureMapProvider.php

@@ -29,6 +29,7 @@
 use function explode;
 use function is_string;
 use function sprintf;
+use function str_contains;
 use function strtolower;
 
 class Php8SignatureMapProvider implements SignatureMapProvider

src/Rules/FunctionCallParametersCheck.php

@@ -27,6 +27,7 @@
 use PHPStan\Type\VerbosityLevel;
 use function array_fill;
 use function array_key_exists;
+use function array_pop;
 use function count;
 use function implode;
 use function is_string;

src/Rules/PhpDoc/InvalidPHPStanDocTagRule.php

@@ -58,6 +58,7 @@ class InvalidPHPStanDocTagRule implements Rule
 		'@phpstan-param-immediately-invoked-callable',
 		'@phpstan-param-later-invoked-callable',
 		'@phpstan-param-closure-this',
+		'@phpstan-skip-php8-stubs',
 	];
 
 	public function __construct(