Update pangolin to 3.1.18 (#32625)
Update pangolin to 3.1.18 (#32625)

* Update pangolin to 3.1.18

* pin latest releases of pangolearn, scorpio, constellations, and pango-designations

* Update meta.yaml

Co-authored-by: Robert A. Petit III <de87a60f0bef9081cf2ce08c083f01f11d90ac84@gmail.com>
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