Compatibility with latest fastapi & pydantic #243

Job	Run time
test with Py3.9 (fastapi==default; pydantic==default)	21s
test with Py3.9 (fastapi==default; pydantic==latest)	24s
test with Py3.9 (fastapi==latest; pydantic==default)	25s
test with Py3.9 (fastapi==latest; pydantic==latest)	23s
test with Py3.10 (fastapi==default; pydantic==default)	32s
test with Py3.10 (fastapi==default; pydantic==latest)	31s
test with Py3.10 (fastapi==latest; pydantic==default)	27s
test with Py3.10 (fastapi==latest; pydantic==latest)	26s
test with Py3.11 (fastapi==default; pydantic==default)	21s
test with Py3.11 (fastapi==default; pydantic==latest)	22s
test with Py3.11 (fastapi==latest; pydantic==default)	32s
test with Py3.11 (fastapi==latest; pydantic==latest)	21s
test with Py3.12 (fastapi==default; pydantic==default)	20s
test with Py3.12 (fastapi==default; pydantic==latest)	21s
test with Py3.12 (fastapi==latest; pydantic==default)	30s
test with Py3.12 (fastapi==latest; pydantic==latest)	28s
test with Py3.13 (fastapi==default; pydantic==default)	23s
test with Py3.13 (fastapi==default; pydantic==latest)	22s
test with Py3.13 (fastapi==latest; pydantic==default)	27s
test with Py3.13 (fastapi==latest; pydantic==latest)	31s
	8m 27s

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