active_hash: The force argument of ActiveFile::Base.reload should be optional (#880)

ref: https://github.com/active-hash/active_hash/blob/3151947ca1c6217443eba940107a14f7450ff0ac/lib/active_file/base.rb#L16

Author: tk0miya

gems/active_hash/3.2/active_file.rbs

@@ -2,6 +2,6 @@ module ActiveFile
   class Base < ActiveHash::Base
     def self.set_root_path: (String) -> void
     def self.set_filename: (String) -> void
-    def self.reload: (bool) -> void
+    def self.reload: (?bool) -> void
   end
 end