Update function-schemata sub-module to HEAD (b2b3612)
New changes:
91d90cd Follow-up eda2afd5a: Drop last remaining async traces
14f5eba schemaTest: Also check the unhappy path for isVoid()
f31f904 schemaTest: Check the unhappy path for getSubSchemas_
b2b3612 schemaTest: Check that validator for Z41/Z42 falls back to Z40 schema
Change-Id: I31b7ecdb513c79231fc88887a36be98077f99850