Add mechanisme to prevent using outdated config

Author: jderusse

CHANGELOG.md

@@ -22,7 +22,7 @@ CHANGELOG
  * Add a `framework.router.cache_dir` configuration option to configure the default `Router` `cache_dir` option
  * Add option `framework.messenger.buses.*.default_middleware.allow_no_senders` to enable throwing when a message doesn't have a sender
  * Deprecate `AbstractController::renderForm()`, use `render()` instead
- * Deprecate `FrameworkExtension::registerRateLimiter()`, to be made private in 7.0
+ * Deprecate `FrameworkExtension::registerRateLimiter()`
 
 6.1
 ---