Fix the URL of comment for image_optim fork [skip ci] (PR #12272)

The previous PR FEATURE: Timeout option for ImageOptim. by tgxworld · Pull Request #162 · toy/image_optim · GitHub was closed and a new PR FEATURE: Timeout option for ImageOptim. by oblakeerickson · Pull Request #189 · toy/image_optim · GitHub has been submitted.

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sorry @okuramasafumi we are not really allowed to look at the PR without a CLA, if CLA is a problem then I am sure @oblakeerickson can figure out what is wrong with our comment and sort it out.

sorry closing, I no cla :frowning: