feat: Nested schema properties can now be defined as nullable (#2488) #6644

Job	Run time
External Tests	1m 48s
Test on 3.8 (tests) / ubuntu-latest / SQLAlchemy: 2	32s
Test on 3.9 (tests) / ubuntu-latest / SQLAlchemy: 2	37s
Test on 3.10 (tests) / ubuntu-latest / SQLAlchemy: 2	32s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 2	27s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 2	30s
Test on 3.13 (tests) / ubuntu-latest / SQLAlchemy: 2	40s
Test on 3.8 (tests) / macos-latest / SQLAlchemy: 2	1m 5s
Test on 3.9 (tests) / macos-latest / SQLAlchemy: 2	48s
Test on 3.10 (tests) / macos-latest / SQLAlchemy: 2	31s
Test on 3.11 (tests) / macos-latest / SQLAlchemy: 2	31s
Test on 3.12 (tests) / macos-latest / SQLAlchemy: 2	33s
Test on 3.13 (tests) / macos-latest / SQLAlchemy: 2	51s
Test on 3.8 (tests) / windows-latest / SQLAlchemy: 2	1m 33s
Test on 3.9 (tests) / windows-latest / SQLAlchemy: 2	1m 28s
Test on 3.10 (tests) / windows-latest / SQLAlchemy: 2	1m 36s
Test on 3.11 (tests) / windows-latest / SQLAlchemy: 2	1m 37s
Test on 3.12 (tests) / windows-latest / SQLAlchemy: 2	1m 52s
Test on 3.13 (tests) / windows-latest / SQLAlchemy: 2	2m 6s
Test on 3.13 (tests) / ubuntu-latest / SQLAlchemy: 1	44s
Test on 3.13 (doctest) / ubuntu-latest / SQLAlchemy: 2	25s
Test on 3.12 (mypy) / ubuntu-latest / SQLAlchemy: 2	36s
Test on 3.12 (deps) / ubuntu-latest / SQLAlchemy: 2	12s
Coverage	21s
	21m 55s

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