fix: support PDOStatement subclasses in PdoStatementExecuteMethodRule

[vaielab]

Hello, me again! Here is another problem I found while using your extension. Hope this helps.

Problem

PdoStatementExecuteMethodRule was skipping analysis when execute() is called on a subclass of PDOStatement that overrides the method. This is because the rule checked whether execute() was declared in PDOStatement:

if (PDOStatement::class !== $methodReflection->getDeclaringClass()->getName()) {
  return [];
}

When a subclass overrides execute(), the declaring class is the subclass and not PDOStatement, so the rule bailed out early, silently missing placeholder errors.

Fix

Replace the declaring-class check with a type check on the call's receiver:

if (!(new \PHPStan\Type\ObjectType(PDOStatement::class))->isSuperTypeOf($scope->getType($methodCall->var))->yes()) {
  return []; 
}

This correctly handles PDOStatement itself and any subclass, regardless ofwhether execute() is inherited or overridden.

Tests

• Added MyPdoStatement fixture (extends PDOStatement, overrides execute())
• Added pdo-stmt-execute-subclassed.php test data with both error and no-error cases
• Added testSubclassedPdoStatement() to PdoStatementExecuteMethodRuleTest