Migrate pallet-democracy benchmarks to benchmark v2 syntax (#6509)
# Description Migrates pallet-democracy benchmarks to benchmark v2 syntax This is Part of https://github.com/paritytech/polkadot-sdk/issues/6202 --------- Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: command-bot <> Co-authored-by: Dmitry Markin <[email protected]> Co-authored-by: Alexandru Vasile <[email protected]>