Update function-schemata sub-module to HEAD (a19a2e3)
New changes:
560509f definitions: Add Z823/Get envelope from Function call and Z923 built-in
d55b863 definitions: Define Z828/Fetch persistent ZObject and Z928 built-in
a19a2e3 definitions: Add Z1653/sh-cyrl and Z1669/sh-latn natural languages
Bug: T268033
Bug: T287428
Bug: T287429
Change-Id: I726cc02351d27e31f810ba76098d9ca6667bcd70