Upgrade to supercaml 1.3.
Upgrade to supercaml 1.3.

Summary: This just upgrades us and Flow to use supercaml 1.3.

Reviewed By: vassilmladenov

Differential Revision: D13330914

fbshipit-source-id: c4bb49d5f98a6b6f9131ac5ad427afdbd5717454

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