fix: BLAKE2 precompile address in LoadTester contract

[leovct]

Description

Closes #430

Fix typo in BLAKE2 precompile address.

For reference: https://eips.ethereum.org/EIPS/eip-152

Jira / Linear Tickets

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Testing

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[doutv]

@leovct This PR doesn't fix the problem

Blake2f input should be different from the ECPairing input. You need to check the definition

Run loadtest --mode pr will get error

7:02PM TRC Executing contract method method=TestBlake2f
7:02PM ERR Recorded an error while sending transactions error="execution reverted" nonce=383807 request time=3

[leovct]

@leovct This PR doesn't fix the problem

Blake2f input should be different from the ECPairing input. You need to check the definition

Run loadtest --mode pr will get error

7:02PM TRC Executing contract method method=TestBlake2f
7:02PM ERR Recorded an error while sending transactions error="execution reverted" nonce=383807 request time=3

Thanks for pointing that out, I didn't check the implementation, my bad. It should be fixed now.