Update maximum credits awarded per vote from 8 to 16 #316

Job	Run time
cargo-test-sbf (token/program)	8m 22s
check	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 23s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 10s
cargo-test-sbf (token-upgrade/program)	8m 13s
cargo-test-sbf (feature-proposal/program)	8m 0s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 5s
cargo-test-sbf (memo/program)	10m 3s
cargo-test-sbf (name-service/program)	7m 58s
cargo-test-sbf (stake-pool/program)	11m 35s
cargo-test-sbf (single-pool/program)	8m 58s
	1h 39m 47s

Provide feedback