Update ruby-vips to fix a method redefinition warning

Ref: libvips/ruby-vips#388

Author: byroot

Gemfile.lock

@@ -240,7 +240,9 @@ GEM
     faraday-retry (1.0.3)
     faraday_middleware (1.2.0)
       faraday (~> 1.0)
-    ffi (1.16.3)
+    ffi (1.17.0)
+    ffi (1.17.0-x86_64-darwin)
+    ffi (1.17.0-x86_64-linux-gnu)
     fugit (1.9.0)
       et-orbi (~> 1, >= 1.2.7)
       raabro (~> 1.4)
@@ -499,8 +501,9 @@ GEM
       rubocop-performance
       rubocop-rails
     ruby-progressbar (1.13.0)
-    ruby-vips (2.2.0)
+    ruby-vips (2.2.2)
       ffi (~> 1.12)
+      logger
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     rufus-scheduler (3.9.1)