[ticket/14247] Use quotes around @ and % strings in YAML

PHPBB3-14247

phpBB/config/default/container/services_http.yml

@@ -2,16 +2,16 @@ services:
     http_kernel:
         class: Symfony\Component\HttpKernel\HttpKernel
         arguments:
-            - @dispatcher
-            - @controller.resolver
-            - @request_stack
+            - '@dispatcher'
+            - '@controller.resolver'
+            - '@request_stack'
 
     # WARNING: The Symfony request does not escape the input and should be used very carefully
     #           prefer the phpbb request (service @request) as possible
     symfony_request:
         class: phpbb\symfony_request
         arguments:
-            - @request
+            - '@request'
 
     request_stack:
         class: Symfony\Component\HttpFoundation\RequestStack
@@ -20,4 +20,4 @@ services:
         class: phpbb\request\request
         arguments:
             - null
-            - %core.disable_super_globals%
+            - '%core.disable_super_globals%'