Update RBS signature for TypeParam#initialize

Signed-off-by: Alexandre Terrasa <[email protected]>

Author: Morriar

sig/type_param.rbs

@@ -26,7 +26,7 @@ module RBS
 
       attr_reader default_type: Types::t?
 
-      def initialize: (name: Symbol, variance: variance, upper_bound: Types::t?, location: loc?, ?default_type: Types::t?) -> void
+      def initialize: (name: Symbol, variance: variance, upper_bound: Types::t?, location: loc?, ?default_type: Types::t?, ?unchecked: bool) -> void
 
       include _ToJson