build: Use `trait Error` from core #762

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Run time

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Job	Run time
clippy	26s
docs	4m 46s
Check README	3s
kani	44s
machete	15s
minimal-versions	35s
msrv	26s
no-std	23s
rustfmt	14s
test (stable, ubuntu-latest)	6m 46s
toml_validation	9s
test (stable, macos-latest)	3m 47s
unused_dependencies	9m 11s
test (stable, windows-latest)	8m 20s
all systems go	0s
	36m 5s