chore: switch to pyproject #39

Job	Run time
matrix	5s
test (3.8)	32s
test (3.9)	34s
test (3.10)	43s
test (3.11)	29s
test (3.12)	41s
test (3.13)	34s
test (3.8, typer-minimal)	35s
test (3.8, pydantic-latest)	31s
test (3.8, typer-latest)	31s
test (3.13, typer-minimal)	36s
test (3.13, pydantic-latest)	34s
test (3.13, typer-latest)	38s
test (3.8, typer-latest, windows-latest)	1m 17s
test (3.8, typer-latest, macos-latest)	1m 16s
test (3.13, typer-latest, windows-latest)	1m 49s
test (3.13, typer-latest, macos-latest)	24s
	11m 49s

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