fix: fix the gas price check for opBNB #211

Job	Run time
clippy / optimism	1m 50s
check	56s
clippy / bsc	1m 43s
check serde	57s
docs / optimism	1m 29s
check std	57s
docs / bsc	1m 31s
fmt	6s
TyposCheck	5s
test stable --no-default-features	57s
test stable	59s
test stable --features bsc	1m 18s
test stable --features optimism,opbnb	1m 23s
test beta --no-default-features	1m 6s
test beta	1m 23s
test beta --features bsc	1m 16s
test beta --features optimism,opbnb	1m 30s
test nightly --no-default-features	2m 48s
test nightly	2m 43s
test nightly --features bsc	2m 51s
test nightly --features optimism,opbnb	2m 56s
	30m 44s

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