bump rubytree

Gemfile

@@ -58,7 +58,7 @@ gem 'acts_as_list', '~> 1.0.1'
 gem 'acts_as_tree', '~> 2.9.0'
 gem 'awesome_nested_set', '~> 3.5.0'
 gem 'closure_tree', '~> 7.4.0'
-gem 'rubytree', '~> 1.0.0'
+gem 'rubytree', '~> 2.0.0'
 # Only used in down migrations now.
 # Is to be removed once the referencing migrations have been squashed.
 gem 'typed_dag', '~> 2.0.2', require: false

Gemfile.lock

@@ -885,9 +885,8 @@ GEM
       nokogiri (>= 1.10.5)
       rexml
     ruby2_keywords (0.0.5)
-    rubytree (1.0.2)
-      json (~> 2.6.1)
-      structured_warnings (~> 0.4.0)
+    rubytree (2.0.0)
+      json (~> 2.0, > 2.3.1)
     rubyzip (2.3.2)
     sanitize (6.0.0)
       crass (~> 1.0.2)
@@ -1152,7 +1151,7 @@ DEPENDENCIES
   ruby-duration (~> 3.2.0)
   ruby-prof
   ruby-progressbar (~> 1.11.0)
-  rubytree (~> 1.0.0)
+  rubytree (~> 2.0.0)
   sanitize (~> 6.0.0)
   sassc-rails
   secure_headers (~> 6.3.0)