test: fixes for test after eth 5 to 6 migration #384

Job	Run time
API test set: stub.test.ts / Node: lts/*	11m 4s
API test set: accounts.test.ts / Node: lts/*	12m 14s
API test set: addresses.test.ts / Node: lts/*	12m 27s
API test set: batches.test.ts / Node: lts/*	11m 43s
API test set: blocks.test.ts / Node: lts/*	11m 25s
API test set: contracts.test.ts / Node: lts/*	11m 36s
API test set: logs.test.ts / Node: lts/*	11m 44s
API test set: stats.test.ts / Node: lts/*	11m 27s
API test set: tokens.test.ts / Node: lts/*	11m 40s
API test set: transactions.test.ts / Node: lts/*	13m 24s
	1h 58m 44s

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