Scrutinizer Faulty Analysis (#2704)

Despite typehint, Scrutinizer assigns union type to a variable, resulting in subsequent faulty analysis of a method call invoked on that variable. Adding a bogus routine that will never actually be called to one module eliminates 8 Scrutinizer errors.

src/PhpSpreadsheet/Spreadsheet.php

@@ -1602,4 +1602,14 @@ class Spreadsheet
             }
         }
     }
+
+    /**
+     * Silliness to mollify Scrutinizer.
+     *
+     * @codeCoverageIgnore
+     */
+    public function getSharedComponent(): Style
+    {
+        return new Style();
+    }
 }