Remove dead method in cluster_info_vote_listener.rs #11783

Job	Run time
cargo-test-sbf (token/program)	9m 58s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 28s
check	4m 8s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 40s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 24s
cargo-test-sbf (token-upgrade/program)	9m 46s
test (single-pool/cli, single-pool/program)	18m 36s
cargo-test-sbf (feature-proposal/program)	9m 53s
test (token-upgrade/cli, token-upgrade/program)	17m 4s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 33s
cargo-test-sbf (memo/program)	9m 19s
cargo-test-sbf (name-service/program)	10m 15s
cargo-test-sbf (stake-pool/program)	13m 29s
cargo-test-sbf (single-pool/program)	10m 23s
	2h 53m 56s

Provide feedback