chore: switch to pyproject #38

Job	Run time
matrix	6s
test (3.8)	33s
test (3.9)	29s
test (3.10)	32s
test (3.11)	29s
test (3.12)	30s
test (3.13)	37s
test (3.8, typer-minimal)	35s
test (3.8, pydantic-latest)	36s
test (3.8, typer-latest)	33s
test (3.13, typer-minimal)	35s
test (3.13, pydantic-latest)	37s
test (3.13, typer-latest)	32s
test (3.8, typer-latest, windows-latest)	1m 11s
test (3.8, typer-latest, macos-latest)	1m 24s
test (3.13, typer-latest, windows-latest)	2m 45s
test (3.13, typer-latest, macos-latest)	28s
	12m 32s

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