Migrate pallet-democracy benchmarks to benchmark v2 syntax (#6509) #1

Job	Run time
check-dependency-rules	11s
check-fail-ci	16s
check-markdown	13s
check-readme	3m 3s
check-workspace	14s
preflight / preflight	7s
preflight / ci-versions	1m 11s
test-rust-features	2m 18s
check-rust-feature-propagation	2m 22s
fmt	1m 17s
check-toml-format	1m 14s
check-umbrella	2m 34s
All quick checks passed	1s
	15m 1s

Provide feedback