Compatibility with latest fastapi & pydantic #143

Job	Run time
test with Py3.7 (fastapi==default; pydantic==default)	1m 24s
test with Py3.7 (fastapi==default; pydantic==latest)	1m 18s
test with Py3.7 (fastapi==latest; pydantic==default)	1m 26s
test with Py3.7 (fastapi==latest; pydantic==latest)	1m 16s
test with Py3.8 (fastapi==default; pydantic==default)	1m 6s
test with Py3.8 (fastapi==default; pydantic==latest)	59s
test with Py3.8 (fastapi==latest; pydantic==default)	1m 14s
test with Py3.8 (fastapi==latest; pydantic==latest)	57s
test with Py3.9 (fastapi==default; pydantic==default)	54s
test with Py3.9 (fastapi==default; pydantic==latest)	58s
test with Py3.9 (fastapi==latest; pydantic==default)	1m 3s
test with Py3.9 (fastapi==latest; pydantic==latest)	1m 24s
test with Py3.10 (fastapi==default; pydantic==default)	1m 9s
test with Py3.10 (fastapi==default; pydantic==latest)	1m 9s
test with Py3.10 (fastapi==latest; pydantic==default)	54s
test with Py3.10 (fastapi==latest; pydantic==latest)	1m 6s
	18m 17s

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