fix: deserialize from str for serde YAML compatibility #551

Job	Run time
test (stable, ubuntu-latest, stable)	6m 9s
rustfmt	17s
msrv	1m 19s
cross (i686-unknown-linux-gnu)	1m 26s
test (beta, ubuntu-latest, beta)	6m 5s
cross (aarch64-unknown-linux-gnu)	1m 47s
test (nightly, ubuntu-latest, nightly)	4m 32s
wasm32-unknown-uknown	27s
cross (powerpc-unknown-linux-gnu)	2m 2s
test (macos, macos-latest, stable)	6m 22s
testbench	57s
cross (powerpc64-unknown-linux-gnu)	1m 53s
test (win-msvc, windows-latest, stable)	5m 40s
wasm32-wasip1	1m 15s
cross (s390x-unknown-linux-gnu)	1m 55s
win-gnu	2m 30s
wasm32-unknown-emscripten	2m 8s
	46m 44s

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