update the php slim version to 3.8.1 and slim/php-view to 2.2.0 (#2997)

frameworks/PHP/slim/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "slim/slim": "3.3.0",
-        "slim/php-view": "2.1.0" 
+        "slim/slim": "3.8.1",
+        "slim/php-view": "2.2.0"
     }
 }