chore: Prepare release 2.18.0 #6051

Job	Run time
pyright	40s
mypy	1m 7s
validate	1m 2s
slotscheck	26s
Test server integration (uvicorn<0.27.0)	54s
test_typing_extensions (4.12.1)	18s
test_typing_extensions (4.13.1)	17s
Test server integration (uvicorn>=0.27.0)	55s
test_typing_extensions (latest)	18s
Test Minimal Pydantic 1 application	33s
Test Minimal Application with Base Dependencies	19s
test (3.13) / test	2m 20s
test (3.9) / test	2m 3s
test (3.10) / test	2m 1s
test (3.8) / test	3m 21s
test (3.12) / test	3m 11s
test (3.11) / test	1m 56s
test-platform-compat	0s
build-docs	1m 21s
test_success	4s
codeql	2m 10s
upload-test-coverage	18s
	25m 34s

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