Reduce buffer size of unused side of socket #14276

Job	Run time
cargo-test-sbf (token/program)	9m 13s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 12s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 55s
check	5m 34s
cargo-test-sbf (token-upgrade/program)	9m 17s
cargo-test-sbf (feature-proposal/program)	8m 29s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 24s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	16m 2s
cargo-test-sbf (name-service/program)	8m 26s
test (single-pool/cli, single-pool/program)	16m 15s
cargo-test-sbf (stake-pool/program)	12m 15s
test (token-upgrade/cli, token-upgrade/program)	14m 56s
cargo-test-sbf (single-pool/program)	9m 25s
	2h 27m 23s

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