Fix Creation of dynamic property warning in PHP 8.2 (#501)

* Fix `Creation of dynamic property` warning in PHP 8.2

* Update IlluminateSnappyPdf.php

Author: JayBizzle

src/IlluminateSnappyPdf.php

@@ -4,6 +4,10 @@
 use Illuminate\Filesystem\Filesystem;
 
 class IlluminateSnappyPdf extends Pdf {
+    /**
+     * @var \Illuminate\Filesystem\Filesystem
+     */
+	protected $fs;
 
 	/**
 	 * @param \Illuminate\Filesystem\Filesystem
@@ -101,4 +105,4 @@ protected function mkdir($pathname)
         return $this->fs->makeDirectory($pathname, 0777, true, true);
     }
 
-}
+}

src/PdfWrapper.php

@@ -23,7 +23,16 @@ class PdfWrapper{
      * @var array
      */
     protected $options = array();
+    
+    /**
+     * @var string
+     */
+    protected $html;
 
+    /**
+     * @var string
+     */
+    protected $file;
 
     /**
      * @param \Knp\Snappy\Pdf $snappy