Fix PHP8.5 lint errors

[staabm]

fixes

Parse error: tests/PHPStan/Rules/DeadCode/data/call-to-static-method-without-impure-points-pipe.php:17
    15| function (): void {
    16| 	5 |> Foo::doFoo(...);
  > 17| 	5 |> fn ($x) => Foo::doFoo($x);
    18| };
Arrow functions on the right hand side of |> must be parenthesized
------------------------------------------------------------
Parse error: tests/PHPStan/Rules/DeadCode/data/call-to-function-without-impure-points-pipe.php:10
     8| 
     9| 5 |> myFunc(...);
  > 10| 5 |> fn ($x) => myFunc($x);
Arrow functions on the right hand side of |> must be parenthesized
------------------------------------------------------------
Parse error: tests/PHPStan/Rules/DeadCode/data/call-to-method-without-impure-points-pipe.php:18
    16| 	$foo = new Foo();
    17| 	5 |> $foo->maybePure(...);
  > 18| 	5 |> fn ($x) => $foo->maybePure($x);
    19| };
Arrow functions on the right hand side of |> must be parenthesized

as it seems they will not get rid of this caveats

[ondrejmirtes]

Opened nikic/PHP-Parser#1124.

[ondrejmirtes]

Thank you!