build: prepare v0.18.3.0

[selsta]

No description provided.

[plowsof]

./monero-blockchain-export --data-dir /var/lib/monero/.bitmonero --blocksdat --output-file blockchain.dat --block-stop 2971000
sha256sum blockchain.dat
10b24cd1f61aeb4b07a0569af6b80db91d58f12bdc93cd4711e52a1410c7b5f5

height="2971000"
difficulty="0x436e532738b8b5b"
hash="3d4cac5ac515eeabd18769ab943af85f36db51d28720def0d0e6effc2c8f5ce3"
node=127.0.0.1:18081
REQ=$(curl http://${node}/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"get_block_header_by_height","params":{"height":'${height}'}}' -H 'Content-Type: application/json')
DATA=$(echo $REQ | jq '.result.block_header')
actual_difficulty=$(echo $DATA | jq -r '.wide_cumulative_difficulty' )
actual_hash=$(echo $DATA | jq -r '.hash')
if [ "$actual_hash" != "$hash" ]; then 
        echo "hashes don't match"; exit
fi
if [ "$difficulty" != "$actual_difficulty" ]; then
        echo "difficulty not equal"; exit
fi
echo "OK"