Fix more PHP 8.1 compat features

Author: allejo

src/main/php/org/bovigo/vfs/visitor/vfsStreamPrintVisitor.php

@@ -50,6 +50,7 @@ public function __construct($out = STDOUT)
         }
 
         $this->out = $out;
+        $this->depth = 0;
     }
 
     /**

src/test/php/org/bovigo/vfs/vfsStreamUmaskTestCase.php

@@ -146,7 +146,7 @@ public function createDirectoryUsingStreamWithExplicit0()
     {
         $root = vfsStream::setup();
         vfsStream::umask(0022);
-        mkdir(vfsStream::url('root/newdir'), null);
+        mkdir(vfsStream::url('root/newdir'), 0000);
         $this->assertEquals(0000, $root->getChild('newdir')->getPermissions());
     }