Fix namespace

Author: janedbal

tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php

@@ -46,7 +46,6 @@
 use PHPStan\Type\VerbosityLevel;
 use PHPUnit\Framework\Constraint\IsEqual;
 use PHPUnit\Framework\Constraint\IsIdentical;
-use Platform\TypedExpressionBooleanPiFunction;
 use Throwable;
 use function floor;
 use function getenv;

tests/Platform/TypedExpressionBooleanPiFunction.php

@@ -1,6 +1,6 @@
 <?php declare(strict_types = 1);
 
-namespace Platform;
+namespace PHPStan\Platform;
 
 use Doctrine\DBAL\Types\Type;
 use Doctrine\DBAL\Types\Types;