[GH-2873] Ensure fog is using fog-core 1.22+

fog-v1.22.0 went out with the dependencies loosely defined so it would
accept fog-core-v1.21.

fog/fog-core@e164cc7 removed a Vsphere helper method than had been
incorrectly defined on the Fog module. This was then extracted into
fog-core.

The fix was applied to `fog` already but the dependencies allow the
incorrect version of fog to run with the cleaned up version of fog-core
whilst they should not.

fog.gemspec

@@ -41,7 +41,7 @@ Gem::Specification.new do |s|
 
   ## List your runtime dependencies here. Runtime dependencies are those
   ## that are needed for an end user to actually USE your code.
-  s.add_dependency("fog-core", "~> 1.21", ">= 1.21.1")
+  s.add_dependency("fog-core", "~> 1.22")
   s.add_dependency("fog-json")
 
   s.add_dependency('nokogiri', '~> 1.5', '>= 1.5.11')

lib/fog/version.rb

@@ -1,3 +1,3 @@
 module Fog
-  VERSION = '1.22.0'
+  VERSION = '1.22.1'
 end