fix(typing): always unwrap `TypeAliasType`s #4750

Job	Run time
mypy	1m 0s
pyright	37s
slotscheck	20s
Test server integration (uvicorn<0.27.0)	41s
Test Minimal Application with Base Dependencies	13s
Test Minimal Pydantic 1 application	16s
Test server integration (uvicorn>=0.27.0)	39s
test-platform-compat	0s
validate	19s
test (3.10) / test	1m 52s
test (3.12) / test	1m 58s
test (3.11) / test	1m 42s
test (3.13) / test	1m 47s
test (3.8) / test	1m 56s
test (3.9) / test	1m 46s
build-docs	2m 14s
upload-test-coverage	0s
codeql	0s
sonar	0s
	17m 20s

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