eliminate relative paths from Cargo.toml #623

Job	Run time
docs	2m 40s
Rust unit tests (ubuntu-latest)	3m 23s
lint	2m 50s
coverage	5m 7s
Rust unit tests (macos-latest)	2m 58s
Rust unit tests (windows-latest)	4m 36s
Rustfmt	12s
typecheck	1m 46s
test (macos-latest, 3.8)	6m 15s
test (macos-latest, 3.9)	8m 19s
test (macos-latest, 3.10)	11m 28s
test (macos-latest, 3.11)	6m 46s
test (macos-latest, 3.12-dev)	13m 34s
test (ubuntu-latest, 3.8)	6m 49s
test (ubuntu-latest, 3.9)	6m 7s
test (ubuntu-latest, 3.10)	7m 26s
test (ubuntu-latest, 3.11)	5m 51s
test (ubuntu-latest, 3.12-dev)	7m 32s
test (windows-latest, 3.8)	9m 45s
test (windows-latest, 3.9)	9m 29s
test (windows-latest, 3.10)	9m 33s
test (windows-latest, 3.11)	12m 5s
test (windows-latest, 3.12-dev)	15m 25s
	2h 39m 56s

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