deps: float the lance 12 / lancedb 0.39 pins

[AdaWorldAPI]

01c2eef pinned lance = "=12.0.0" / lancedb = "=0.39.0" exactly. The ecosystem pin rule floats the patch and never uses a .0.0 exact pin, so these become 12.* / 0.39.*. lancedb 0.39 itself demands lance = "=12.0.0", so the float resolves to exactly that today and can never be narrower than what the family asks.

The pins stay dormant: no OGAR crate consumes them yet. The manifest note now records that the first lancedb consumer needs features = ["remote"], because 0.39.0 does not compile without it (the job.rs / Error::Http gating defect).

It's a manifest-only change, with nothing to build against it.

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