fix: OpenFeature::SDK::Configuration uses concurrent-ruby gem even though it doesn't depend on it (#61)

Signed-off-by: Josh Nichols <[email protected]>

Author: technicalpickles

lib/openfeature/sdk/configuration.rb

@@ -18,7 +18,7 @@ class Configuration
       def_delegator :@provider, :metadata
 
       def initialize
-        @hooks = Concurrent::Array.new([])
+        @hooks = []
       end
     end
   end