Fix gems we'd locked to old versions

Now that we're on Ruby 2.6, the constraints on the latest versions of these dependencies are satisfied, so we can stop holding them back!

Gemfile

@@ -29,7 +29,7 @@ gem 'http_accept_language', '~> 2.1', '>= 2.1.1'
 gem 'globalize', '~> 6.2', '>= 6.2.1'
 
 # For reading and parsing HTML from Neopets.com, like importing Closet pages.
-gem 'nokogiri', '~> 1.10', '>= 1.10.10'
+gem 'nokogiri', '~> 1.13', '>= 1.13.10'
 gem "rest-client", "~> 1.6.7"
 
 # For safely rendering users' Markdown + HTML on item list pages.
@@ -56,14 +56,6 @@ gem "parallel", "~> 1.13.0"
 # For debugging.
 gem 'web-console', '~> 3.7'
 
-# TODO: Rails requests the latest version of these dependencies, but they
-# require Ruby 2.5 or higher, so we have to request lower ones instead!
-# (loofah is slightly trickier: it requires a recent nokogiri, but recent
-# nokogiri requires Ruby 2.6, so, yeah.)
-gem 'loofah', '~> 2.20', '< 2.21'
-gem 'minitest', '~> 5.15', '< 5.16'
-gem 'mail', '~> 2.7', '>= 2.7.1', '< 2.8'
-
 # TODO: Review our use of content_tag_for etc and uninstall this!
 gem 'record_tag_helper', '~> 1.0'
 

Gemfile.lock

@@ -85,6 +85,7 @@ GEM
     concurrent-ruby (1.2.2)
     connection_pool (2.2.5)
     crass (1.0.6)
+    date (3.3.3)
     devise (4.9.2)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -122,35 +123,49 @@ GEM
       addressable (~> 2.3)
     letter_opener (1.4.1)
       launchy (~> 2.2)
-    loofah (2.20.0)
+    loofah (2.21.3)
       crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
-    mail (2.7.1)
+      nokogiri (>= 1.12.0)
+    mail (2.8.1)
       mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
     marcel (1.0.2)
     memcache-client (1.8.5)
     method_source (1.0.0)
     mime-types (1.25.1)
     mini_mime (1.1.2)
-    mini_portile2 (2.4.0)
-    minitest (5.15.0)
+    mini_portile2 (2.8.4)
+    minitest (5.19.0)
     msgpack (1.6.1)
     multi_json (1.15.0)
     mysql2 (0.5.5)
+    net-imap (0.3.7)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.1)
+      timeout
     net-scp (1.0.4)
       net-ssh (>= 1.99.1)
     net-sftp (2.1.2)
       net-ssh (>= 2.6.5)
+    net-smtp (0.3.3)
+      net-protocol
     net-ssh (2.9.2)
     net-ssh-gateway (1.2.0)
       net-ssh (>= 2.6.5)
     nio4r (2.5.9)
-    nokogiri (1.10.10)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.10)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     openneo-auth-signatory (0.1.0)
       ruby-hmac
     orm_adapter (0.5.0)
     parallel (1.13.0)
+    racc (1.7.1)
     rack (2.2.8)
     rack-attack (2.2.1)
       rack
@@ -239,6 +254,7 @@ GEM
     thor (1.2.2)
     thread_safe (0.3.6)
     tilt (2.2.0)
+    timeout (0.4.0)
     tzinfo (1.2.11)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
@@ -270,13 +286,10 @@ DEPENDENCIES
   haml (~> 6.1, >= 6.1.1)
   http_accept_language (~> 2.1, >= 2.1.1)
   letter_opener
-  loofah (~> 2.20, < 2.21)
-  mail (~> 2.7, >= 2.7.1, < 2.8)
   memcache-client (~> 1.8.5)
-  minitest (~> 5.15, < 5.16)
   msgpack (~> 1.6, >= 1.6.1)
   mysql2 (~> 0.5.5)
-  nokogiri (~> 1.10, >= 1.10.10)
+  nokogiri (~> 1.13, >= 1.13.10)
   openneo-auth-signatory (~> 0.1.0)
   parallel (~> 1.13.0)
   rack-attack (~> 2.2.0)