Add `Default` instance for `UpdateSequenceNumber`. #1893

Job	Run time
Ensure consistency between wat and wasm files	17s
smart-contracts/wasm-transform lint:clippy	29s
smart-contracts/wasm-transform lint:fmt	27s
smart-contracts/wasm-chain-integration lint:fmt	35s
smart-contracts/wasm-transform lint:fmt	12s
smart-contracts/wasm-chain-integration lint:fmt	10s
escrow lint:fmt	13s
lockup lint:fmt	11s
wasm-transform cargo:test	36s
use-all-host-functions lint:fmt	10s
wasm-chain-integration cargo:test	13m 31s
rate-limited lint:fmt	11s
counter lint:fmt	10s
counter cargo:test	16s
context-test lint:fmt	10s
fib lint:fmt	11s
smart-contracts/escrow lint:clippy	18s
smart-contracts/lockup lint:clippy	16s
smart-contracts/wasm-chain-integration lint:clippy	34s
smart-contracts/use-all-host-functions lint:clippy	17s
smart-contracts/wasm-chain-integration lint:clippy	37s
smart-contracts/rate-limited lint:clippy	20s
smart-contracts/wasm-chain-integration lint:clippy	34s
smart-contracts/counter lint:clippy	17s
smart-contracts/context-test lint:clippy	21s
smart-contracts/fib lint:clippy	16s
wasm-core-spec cargo:test	33s
	22m 12s

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