fix: update ruby SDK to increase the possible random numbers used for…

… stickiness id

Same fix as done in some other sdks, such as the node one at
https://github.com/Unleash/unleash-client-node/pull/417o

Fixes an issue where 1% rollout would not yield any results with
random rollout for certain group ids

lib/unleash/strategy/flexible_rollout.rb

@@ -40,7 +40,7 @@ def context_invalid?(stickiness, context)
       end
 
       def random
-        Random.rand(0..100)
+        Random.rand(0..10000)
       end
 
       def resolve_stickiness(stickiness, context)