feature: Build schema on upstream version 3.9.0-rc5 (#213) #655

Job	Run time
Check schema	1m 28s
Build Sphinx Docs	20s
Integration tests (3.11)	55s
Java tests (3.11)	1m 7s
Integration tests (3.12)	1m 2s
Java tests (3.12)	6h 0m 14s
Roundtrip tests (3.11)	57s
Unit tests (3.11)	47s
Roundtrip tests (3.12)	56s
Unit tests (3.12)	1m 7s
Static analysis / Run pre-commit checks	41s
Check packaging metadata / Build and check package metadata	19s
	6h 9m 53s

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