Skip redundant cost limit update in banking-bench #15041

Job	Run time
check	3m 26s
cargo-test-sbf (token/program)	7m 0s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 18s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 13s
test (single-pool/cli, single-pool/program)	16m 6s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	8m 20s
test (token-upgrade/cli, token-upgrade/program)	14m 38s
cargo-test-sbf (token-upgrade/program)	7m 41s
cargo-test-sbf (feature-proposal/program)	7m 15s
cargo-test-sbf (governance/addin-mock/program, governance/program)	10m 29s
cargo-test-sbf (name-service/program)	7m 41s
cargo-test-sbf (stake-pool/program)	10m 2s
cargo-test-sbf (single-pool/program)	7m 40s
	2h 10m 49s

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