Fix PHPParser ArgPlaceholder compat

[staabm]

fixes

------ ----------------------------------------------------------------------- 
  Line   src/Rules/PHPUnit/AssertSameBooleanExpectedRule.php                    
 ------ ----------------------------------------------------------------------- 
  54     Parameter #1 $args of static method                                    
         PHPStan\Rules\PHPUnit\AssertSameBooleanExpectedRule::rewriteArgs()     
         expects array<PhpParser\Node\Arg|PhpParser\Node\VariadicPlaceholder>,  
          array<PhpParser\Node\Arg|PhpParser\Node\ArgPlaceholder|PhpParser\Nod  
         e\VariadicPlaceholder> given.                                          
         🪪  argument.type                                                       
  68     Parameter #1 $args of static method                                    
         PHPStan\Rules\PHPUnit\AssertSameBooleanExpectedRule::rewriteArgs()     
         expects array<PhpParser\Node\Arg|PhpParser\Node\VariadicPlaceholder>,  
          array<PhpParser\Node\Arg|PhpParser\Node\ArgPlaceholder|PhpParser\Nod  
         e\VariadicPlaceholder> given.                                          
         🪪  argument.type                                                       
 ------ ----------------------------------------------------------------------- 

 ------ ----------------------------------------------------------------------- 
  Line   src/Rules/PHPUnit/AssertSameNullExpectedRule.php                       
 ------ ----------------------------------------------------------------------- 
  54     Parameter #1 $args of static method                                    
         PHPStan\Rules\PHPUnit\AssertSameNullExpectedRule::rewriteArgs()        
         expects array<PhpParser\Node\Arg|PhpParser\Node\VariadicPlaceholder>,  
          array<PhpParser\Node\Arg|PhpParser\Node\ArgPlaceholder|PhpParser\Nod  
         e\VariadicPlaceholder> given.                                          
         🪪  argument.type                                                       
 ------ ----------------------------------------------------------------------- 

 [ERROR] Found 3 errors                                                         

[Copilot]

Copilot review overview

🟢 Approval recommended

The annotations address the reported PHPStan compatibility errors.

Review effort: Lite
Findings: None

What changed in this PR

Updates PHPDoc annotations to support PHP-Parser ArgPlaceholder nodes and resolve PHPStan compatibility errors.

Changes:

• Extends argument types in both assertion rules.
• Preserves support for existing argument node types.

File	Description
src/​Rules/​PHPUnit/​AssertSameNullExpectedRule.php	Updates rewriteArgs() annotations.
src/​Rules/​PHPUnit/​AssertSameBooleanExpectedRule.php	Updates rewriteArgs() annotations.

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[staabm]

instead of using a fixed union of types (which depends on PHPParser version) use a more generic base class

PHPParser v5.9.0+: Node\Arg|Node\ArgPlaceholder|Node\VariadicPlaceholder
PHPParser <v5.9.0: Node\Arg|Node\VariadicPlaceholder