Update function-schemata sub-module to HEAD (4df73e6)

New changes:

• dd6ceeb Change "claims" labels to "statements" to reduce terminological confusion
• 8f81916 definitions: Revise 2 Wikidata-related labels for clarity
• 26127fc Add new built-in types to the built-in types list
• c2aa74b Add isZError utility function
• bc27c13 Make it possible to deserialize V1.0.0 Avro schema-serialized objects in Rust.
• 5e6b060 build: Upgrade eslint-config-wikimedia to 0.31.0
• 8e99a00 build: Upgrade semver to 7.7.2
• 4df73e6 build: Upgrade rollup to 4.47.1

Bug: T395475
Bug: T399320
Bug: T399423