solana-program: improve VoteState::deserialize_into() #7586

Job	Run time
cargo-test-sbf (token/program)	8m 8s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 20s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 21s
check	3m 36s
cargo-test-sbf (token-upgrade/program)	8m 29s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 18s
cargo-test-sbf (feature-proposal/program)	8m 6s
test (single-pool/cli, single-pool/program)	18m 51s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 7s
test (token-upgrade/cli, token-upgrade/program)	18m 7s
cargo-test-sbf (memo/program)	8m 4s
cargo-test-sbf (name-service/program)	8m 0s
cargo-test-sbf (stake-pool/program)	11m 32s
cargo-test-sbf (single-pool/program)	9m 18s
	2h 41m 17s

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