Update i18n requirement from ~> 0.6.0 to ~> 1.12.0

Updates the requirements on [i18n](https://github.com/ruby-i18n/i18n) to permit the latest version.
- [Release notes](https://github.com/ruby-i18n/i18n/releases)
- [Changelog](https://github.com/ruby-i18n/i18n/blob/master/CHANGELOG.md)
- [Commits](ruby-i18n/i18n@v0.6.5...v1.12.0)

---
updated-dependencies:
- dependency-name: i18n
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -4,17 +4,17 @@ PATH
     gravatar-ultimate (2.0.0)
       activesupport (>= 2.3.14)
       rack
+      xmlrpc
 
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (4.0.1)
-      i18n (~> 0.6, >= 0.6.4)
-      minitest (~> 4.2)
-      multi_json (~> 1.3)
-      thread_safe (~> 0.1)
-      tzinfo (~> 0.3.37)
-    atomic (1.1.14)
+    activesupport (7.0.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    concurrent-ruby (1.1.10)
     coveralls (0.7.0)
       multi_json (~> 1.3)
       rest-client
@@ -23,12 +23,13 @@ GEM
       thor
     diff-lcs (1.2.4)
     fakeweb (1.3.0)
-    i18n (0.6.5)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
     json (1.8.1)
     mime-types (2.0)
-    minitest (4.7.5)
+    minitest (5.16.3)
     multi_json (1.8.2)
-    rack (1.5.2)
+    rack (3.0.0)
     rake (0.9.2.2)
     rdoc (3.12.2)
       json (~> 1.4)
@@ -49,10 +50,12 @@ GEM
     term-ansicolor (1.2.2)
       tins (~> 0.8)
     thor (0.18.1)
-    thread_safe (0.1.3)
-      atomic
     tins (0.12.0)
-    tzinfo (0.3.38)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
+    webrick (1.7.0)
+    xmlrpc (0.3.2)
+      webrick
 
 PLATFORMS
   ruby
@@ -61,7 +64,7 @@ DEPENDENCIES
   coveralls
   fakeweb (>= 1.2.8)
   gravatar-ultimate!
-  i18n (~> 0.6.0)
+  i18n (~> 1.12.0)
   jruby-openssl
   rake (~> 0.9.2.2)
   rdoc (~> 3.11)

gravatar-ultimate.gemspec

@@ -33,7 +33,7 @@ rather than just a URL to that data. This saves you the extra step of having to
 
   s.add_development_dependency('rspec', ">= 1.3.0")
   s.add_development_dependency('fakeweb', ">= 1.2.8")
-  s.add_development_dependency('i18n', '~> 0.6.0')
+  s.add_development_dependency('i18n', '~> 1.12.0')
   s.add_development_dependency('rake', '~> 0.9.2.2')
   s.add_development_dependency('rdoc', '~> 3.11')
   s.add_development_dependency('coveralls')