fix(anvil): update blockhash in db

[mattsse]

Motivation

the test introduced in #2524 makes use of roll cheatcode, first by

vm.roll(block.number - numUpdates);

then simulates mining by

for(uint i = 0; i < numUpdates; i++) {
   vm.roll(block.number + 1);
   hashChecker.update();
}

which does blockhash(block.number - 1)

this highlighted a problem with block hashes in anvil that were not updated internally in the Db

this meant that if a tx requires a hash for a block that was already mined by anvil but is now missing in the DB's internal storage it will try to query it from the endpoint but if there's no new block it will return the 0 hash blockhash(block.number - 1)

Solution

manually insert the new blockhash in the db after mining a new block