FIX: Sort filelists to ensure consistant asset precompilation hash (#13393)

Dir.glob does not guarantee file order and can change when ran on different machines.
This means that running asset precompilation on the exact same codebase will output
different content hashes.

lib/plugin/instance.rb

@@ -755,7 +755,7 @@ class Plugin::Instance
       root_path = "#{File.dirname(@path)}/assets/javascripts"
       admin_path = "#{File.dirname(@path)}/admin/assets/javascripts"
 
-      Dir.glob(["#{root_path}/**/*", "#{admin_path}/**/*"]) do |f|
+      Dir.glob(["#{root_path}/**/*", "#{admin_path}/**/*"]).sort.each do |f|
         f_str = f.to_s
         if File.directory?(f)
           yield [f, true]