Set Kmeans parameter to prior default

[camisowers]

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What is the purpose of this PR?

Maybe fixes #968.

How did you implement your changes

Changes n_init from 'auto' to 10, to keep the algorithm params consistent with the prior default value.

Note: I've pinned alpineer temporarily so that the new multiple tiled stitching adjustments made won't apply until a formal PR is opened. A few of the ark stitching functions will need to be tweaked.

Remaining issues

Unrelated to #967. I'm still not quite sure what's going on there.

[ngreenwald]

Changed the description to avoid closing it until we've tested it to confirm.

I agree about pinning alpineer, the goal of having things in different repos is that nothing will update until we want it to.