fix: correctly serialize eth_call params #2432

Job	Run time
doctest	1m 7s
test ubuntu-latest stable --no-default-features	1m 16s
feature-checks	2m 39s
no-std	20s
test ubuntu-latest stable	1m 10s
test ubuntu-latest nightly --no-default-features	1m 3s
test ubuntu-latest nightly	1m 21s
wasm-wasi	56s
wasm-unknown	53s
test ubuntu-latest 1.76 --no-default-features	36s
test ubuntu-latest 1.76	1m 15s
cfg-check	28s
test windows-latest stable --no-default-features	4m 15s
test windows-latest stable	4m 28s
clippy	34s
test windows-latest nightly --no-default-features	3m 37s
docs	52s
test windows-latest nightly	3m 34s
test windows-latest 1.76 --no-default-features	2m 18s
fmt	13s
test windows-latest 1.76	2m 16s
test ubuntu-latest stable --all-features	1m 50s
test ubuntu-latest nightly --all-features	1m 49s
	38m 50s

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