Fix extra fields check in Model.getattr() #12235

Job	Run time
docs-build	1m 56s
lint 3.8	1m 14s
lint 3.9	1m 2s
lint 3.10	59s
lint 3.11	1m 2s
lint 3.12	58s
test ubuntu / 3.8	1m 58s
test fastapi	1m 44s
test ubuntu / 3.9	2m 7s
test ubuntu / 3.10	2m 3s
test ubuntu / 3.11	2m 8s
test memray	3m 21s
test ubuntu / 3.12	2m 17s
test macos / 3.8	3m 37s
test macos / 3.9	3m 59s
mypy 1.0.1 / 3.10	4m 8s
test macos / 3.10	4m 19s
test pydantic plugin	1m 7s
mypy lockfile / 3.10	3m 58s
test macos / 3.11	2m 53s
mypy 1.2.0 / 3.10	4m 29s
test macos / 3.12	3m 51s
mypy 1.4.1 / 3.10	2m 33s
test typing-extensions 4.6.1 on Python 3.8	1m 59s
test windows / 3.8	2m 52s
mypy 1.5.1 / 3.10	2m 37s
test typing-extensions 4.6.1 on Python 3.9	2m 4s
mypy lockfile / 3.8	3m 37s
test windows / 3.9	2m 39s
test typing-extensions 4.6.1 on Python 3.10	2m 12s
mypy lockfile / 3.9	3m 47s
test windows / 3.10	3m 54s
test typing-extensions 4.6.1 on Python 3.11	1m 57s
mypy lockfile / 3.11	3m 59s
test windows / 3.11	3m 38s
test typing-extensions 4.6.1 on Python 3.12	2m 10s
mypy 1.5.1 / 3.12	2m 55s
test windows / 3.12	3m 51s
test typing-extensions main on Python 3.8	2m 10s
test ubuntu / pypy3.9	6m 42s
test typing-extensions main on Python 3.9	2m 13s
test ubuntu / pypy3.10	7m 13s
test typing-extensions main on Python 3.10	2m 2s
test typing-extensions main on Python 3.11	2m 1s
test typing-extensions main on Python 3.12	2m 18s
coverage-combine	20s
check	2s
release	0s
Send tweet	0s
	2h 6m 55s

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