fix tests in rpc-types-trace crate #42

Job	Run time
cfg-check	27s
docs	30s
clippy	25s
doctest	26s
feature-checks	21s
fmt	13s
no-std	13s
test ubuntu-latest stable --no-default-features	1m 42s
wasm-wasi	1m 1s
wasm-unknown	20s
test ubuntu-latest stable	1m 42s
test ubuntu-latest nightly --no-default-features	1m 41s
test ubuntu-latest nightly	1m 30s
test ubuntu-latest 1.76 --no-default-features	28s
test ubuntu-latest 1.76	47s
test windows-latest stable --no-default-features	2m 40s
test windows-latest stable	2m 41s
test windows-latest nightly --no-default-features	3m 8s
test windows-latest nightly	2m 48s
test windows-latest 1.76 --no-default-features	1m 36s
test windows-latest 1.76	1m 54s
test ubuntu-latest stable --all-features	28s
test ubuntu-latest nightly --all-features	33s
	27m 34s

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