remove `thiserror` dependency #487

Job	Run time
create-git-tag	0s
cargo-publish	0s
Tests (macos-latest, stable)	27s
Tests (macos-latest, beta)	47s
Tests (macos-latest, nightly)	48s
Tests (windows-latest, stable)	2m 12s
Tests (windows-latest, beta)	1m 18s
Tests (windows-latest, nightly)	1m 8s
Tests (ubuntu-latest, stable)	17s
Tests (ubuntu-latest, beta)	38s
Tests (ubuntu-latest, nightly)	38s
	8m 13s

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