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

[thomasheartman]

Same fix as done in some other sdks, such as the node one at
Unleash/unleash-client-node#417

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

[ivarconr]

did you consider a unit test for this?
https://github.com/Unleash/unleash-client-node/blob/main/src/test/strategy/gradual-rollout-random.test.ts#L10-L33

[coveralls]

Pull Request Test Coverage Report for Build 10956081535

Details

• 15 of 15 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 97.25%

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Totals
Change from base Build 10919587464:	0.09%
Covered Lines:	2582
Relevant Lines:	2655

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💛 - Coveralls

[thomasheartman]

I did not (because there was none in the node sdk where I took it from), but lemme see what I can cook up

[thomasheartman]

@ivarconr : that test does not test the fix in the node SDK, which was only applied to the src/strategy/flexible-rollout-strategy.ts file. In fact, the src/strategy/gradual-rollout-random.ts, which this test presumably tests, still only goes to 101. And interestingly, as a follow-up, if I increase the multiplication to 10k (as we've done in the other file), that test starts failing.

However, the same thing in Ruby does appear to work (fails at 100, works at 10k). I've added the test; will merge when everything goes green unless anyone speaks up.