Add `@msaleiko` as Status Page maintainer and to the review roulette rotation.

As @msaleiko is currently the grouprespond DRI, we should add him to the review roulette rotation for the Status Page. This also requires adding him as a maintainer, so that he can merge roulette MRs directly.

We could look at adjusting the frequency if it's too high. Currently it's monthly with roughly 5 dependencies that regularly need an update.