chore: unify etherscan url format #84

Job	Run time
miri --no-default-features	38s
test stable --no-default-features	6s
miri	33s
feature-checks	28s
clippy	22s
test stable	7s
miri --all-features	47s
test stable --all-features	33s
test beta --no-default-features	13s
wasm	8s
test beta	13s
docs	17s
test beta --all-features	21s
test nightly --no-default-features	13s
fmt	10s
test nightly	16s
test nightly --all-features	21s
test 1.65 --no-default-features	23s
test 1.65	22s
	6m 31s

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