buffbench: use base2-free #5918

Job	Run time
build-and-check	3m 8s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 4s
test-integration-common	42s
test-integration-web	40s
test-integration-sdk	1m 21s
test-cli	46s
test-integration-packages/agent-runtime	42s
test-packages/agent-runtime	44s
test-integration-cli	1m 12s
test-packages/billing	41s
test-packages/internal	51s
test-.agents	48s
test-common	42s
test-sdk	48s
test-web	47s
	16m 0s

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