test: fixes for test after eth 5 to 6 migration #389

Job	Run time
API test set: stub.test.ts / Node: lts/*	11m 16s
API test set: accounts.test.ts / Node: lts/*	12m 11s
API test set: addresses.test.ts / Node: lts/*	12m 20s
API test set: batches.test.ts / Node: lts/*	11m 23s
API test set: blocks.test.ts / Node: lts/*	11m 23s
API test set: contracts.test.ts / Node: lts/*	11m 20s
API test set: logs.test.ts / Node: lts/*	11m 17s
API test set: stats.test.ts / Node: lts/*	10m 55s
API test set: tokens.test.ts / Node: lts/*	11m 2s
API test set: transactions.test.ts / Node: lts/*	14m 15s
	1h 57m 22s

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