Fix PHP8.5 lint errors

Author: staabm

tests/PHPStan/Rules/DeadCode/data/call-to-function-without-impure-points-pipe.php

@@ -7,4 +7,4 @@ function myFunc()
 }
 
 5 |> myFunc(...);
-5 |> fn ($x) => myFunc($x);
+5 |> (fn ($x) => myFunc($x));

tests/PHPStan/Rules/DeadCode/data/call-to-method-without-impure-points-pipe.php

@@ -15,5 +15,5 @@ public function maybePure(int $o): int
 function (): void {
 	$foo = new Foo();
 	5 |> $foo->maybePure(...);
-	5 |> fn ($x) => $foo->maybePure($x);
+	5 |> (fn ($x) => $foo->maybePure($x));
 };

tests/PHPStan/Rules/DeadCode/data/call-to-static-method-without-impure-points-pipe.php

@@ -14,5 +14,5 @@ public static function doFoo(int $o): int
 
 function (): void {
 	5 |> Foo::doFoo(...);
-	5 |> fn ($x) => Foo::doFoo($x);
+	5 |> (fn ($x) => Foo::doFoo($x));
 };